MML PRECALCULUS ENHANCED
7th Edition
ISBN: 9780134119250
Author: Sullivan
Publisher: INTER PEAR
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Textbook Question
Chapter 12.2, Problem 48SB
In Problems 39-56, find each sum.
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Total marks 15
3.
(i)
Let FRN Rm be a mapping and x = RN is a given
point. Which of the following statements are true? Construct counterex-
amples for any that are false.
(a)
If F is continuous at x then F is differentiable at x.
(b)
If F is differentiable at x then F is continuous at x.
If F is differentiable at x then F has all 1st order partial
(c)
derivatives at x.
(d) If all 1st order partial derivatives of F exist and are con-
tinuous on RN then F is differentiable at x.
[5 Marks]
(ii) Let mappings
F= (F1, F2) R³ → R² and
G=(G1, G2) R² → R²
:
be defined by
F₁ (x1, x2, x3) = x1 + x²,
G1(1, 2) = 31,
F2(x1, x2, x3) = x² + x3,
G2(1, 2)=sin(1+ y2).
By using the chain rule, calculate the Jacobian matrix of the mapping
GoF R3 R²,
i.e., JGoF(x1, x2, x3). What is JGOF(0, 0, 0)?
(iii)
[7 Marks]
Give reasons why the mapping Go F is differentiable at
(0, 0, 0) R³ and determine the derivative matrix D(GF)(0, 0, 0).
[3 Marks]
5.
(i)
Let f R2 R be defined by
f(x1, x2) = x² - 4x1x2 + 2x3.
Find all local minima of f on R².
(ii)
[10 Marks]
Give an example of a function f: R2 R which is not bounded
above and has exactly one critical point, which is a minimum. Justify briefly
Total marks 15
your answer.
[5 Marks]
Total marks 15
4.
:
Let f R2 R be defined by
f(x1, x2) = 2x²- 8x1x2+4x+2.
Find all local minima of f on R².
[10 Marks]
(ii) Give an example of a function f R2 R which is neither
bounded below nor bounded above, and has no critical point. Justify
briefly your answer.
[5 Marks]
Chapter 12 Solutions
MML PRECALCULUS ENHANCED
Ch. 12.1 - For the function f( x )= x1 x , find f( 2 ) and f(...Ch. 12.1 - True or False A function is a relation between two...Ch. 12.1 - If 1000 is invested at 4 per annum compounded...Ch. 12.1 - How much do you need to invest now at 5 per annum...Ch. 12.1 - Prob. 5AYPCh. 12.1 - True or False The notation a 5 represents the...Ch. 12.1 - If n0 is an integer, then n!= ________ When n2 .Ch. 12.1 - The sequence a 1 =5 , a n =3 a n1 is an example of...Ch. 12.1 - The notation a 1 + a 2 + a 3 ++ a n = k=1 n a k...Ch. 12.1 - k=1 n k=1+2+3++n = ______. (a) n! (b) n( n+1 ) 2...
Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 11-16, evaluate each factorial...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 17-28, write down the first five terms...Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 29-36, the given pattern continues....Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 37-50, a sequence is defined...Ch. 12.1 - In Problems 51-60, write out each sum. k=1 n (...Ch. 12.1 - In Problems 51-60, write out each sum. k=1 n (...Ch. 12.1 - In Problems 51-60, write out each sum. k=1 n k 2...Ch. 12.1 - In Problems 51-60, write out each sum. k=1 n (...Ch. 12.1 - In Problems 51-60, write out each sum. k=0 n 1 3...Ch. 12.1 - In Problems 51-60, write out each sum. k=0 n ( 3...Ch. 12.1 - In Problems 51-60, write out each sum. k=0 n1 1 3...Ch. 12.1 - In Problems 51-60, write out each sum. k=0 n1 (...Ch. 12.1 - In Problems 51-60, write out each sum. k=2 n ( 1...Ch. 12.1 - In Problems 51-60, write out each sum. k=3 n ( 1...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 61-70, express each sum using...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - In Problems 71-82, find the sum of each sequence. ...Ch. 12.1 - If 2500 is invested at 3 compounded monthly, find...Ch. 12.1 - Write the complex number 1i in polar form. Express...Ch. 12.1 - For v=2ij and w=i+2j , find the dot product vw .Ch. 12.1 - Find an equation of the parabola with vertex ( 3,4...Ch. 12.2 - In a(n) _________ sequence, the difference between...Ch. 12.2 - True or False For an arithmetic sequence { a n }...Ch. 12.2 - If the 5th term of an arithmetic sequence is 12...Ch. 12.2 - True or False The sum S n of the first n terms of...Ch. 12.2 - An arithmetic sequence can always be expressed as...Ch. 12.2 - If a n =2n+7 is the n th term of an arithmetic...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 7-16, show that each sequence is...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 17-24, find the nth term of the...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 25-30, find the indicated term in each...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 31-38, find the first term and the...Ch. 12.2 - In Problems 39-56, find each sum. 1+3+5++( 2n1 )Ch. 12.2 - In Problems 39-56, find each sum. 2+4+6++2nCh. 12.2 - In Problems 39-56, find each sum. 7+12+17++( 2+5n...Ch. 12.2 - In Problems 39-56, find each sum. 1+3+7++( 4n5 )Ch. 12.2 - In Problems 39-56, find each sum. 2+4+6++70Ch. 12.2 - In Problems 39-56, find each sum. 1+3+5++59Ch. 12.2 - In Problems 39-56, find each sum. 5+9+13++49Ch. 12.2 - In Problems 39-56, find each sum. 2+5+8++41Ch. 12.2 - In Problems 39-56, find each sum. 73+78+83+88++558Ch. 12.2 - In Problems 39-56, find each sum. 7+1511299Ch. 12.2 - In Problems 39-56, find each sum. 4+4.5+5+5.5++100Ch. 12.2 - In Problems 39-56, find each sum. 8+8 1 4 +8 1 2...Ch. 12.2 - In Problems 39-56, find each sum. n=1 80 ( 2n5 )Ch. 12.2 - In Problems 39-56, find each sum. n=1 90 ( 32n )Ch. 12.2 - In Problems 39-56, find each sum. n=1 100 ( 6 1 2...Ch. 12.2 - In Problems 39-56, find each sum. n=1 80 ( 1 3 n+...Ch. 12.2 - In Problems 39-56, find each sum. The sum of the...Ch. 12.2 - In Problems 39-56, find each sum. The sum of the...Ch. 12.2 - Find x so that x+3,2x+1,and5x+2 are consecutive...Ch. 12.2 - Find x so that 2x,3x+2,and5x+3 are consecutive...Ch. 12.2 - How many terms must be added in an arithmetic...Ch. 12.2 - How many terms must be added in an arithmetic...Ch. 12.2 - Drury Lane Theater The Drury Lane Theater has 25...Ch. 12.2 - Football Stadium The corner section of a football...Ch. 12.2 - Creating a Mosaic A mosaic is designed in the...Ch. 12.2 - Constructing a Brick Staircase A brick staircase...Ch. 12.2 - Cooling Air As a parcel of air rises (for example,...Ch. 12.2 - Prob. 66AECh. 12.2 - Seats in an Amphitheater An outdoor amphitheater...Ch. 12.2 - Stadium Construction How many rows are in the...Ch. 12.2 - Salary If you take a job with a starting salary of...Ch. 12.2 - Make up an arithmetic sequence. Give it to a...Ch. 12.2 - Describe the similarities and differences between...Ch. 12.2 - Problems 72-75 are based on material learned...Ch. 12.2 - Prob. 73RYKCh. 12.2 - Prob. 74RYKCh. 12.2 - Problems 72-75 are based on material learned...Ch. 12.3 - The formula for the n th term of a geometric...Ch. 12.3 - Prob. 2CVCh. 12.3 - Prob. 3CVCh. 12.3 - Prob. 4CVCh. 12.3 - Prob. 5CVCh. 12.3 - Prob. 6CVCh. 12.3 - Prob. 7CVCh. 12.3 - Prob. 8CVCh. 12.3 - Prob. 9SBCh. 12.3 - Prob. 10SBCh. 12.3 - Prob. 11SBCh. 12.3 - Prob. 12SBCh. 12.3 - Prob. 13SBCh. 12.3 - Prob. 14SBCh. 12.3 - Prob. 15SBCh. 12.3 - Prob. 16SBCh. 12.3 - Prob. 17SBCh. 12.3 - Prob. 18SBCh. 12.3 - Prob. 19SBCh. 12.3 - In Problems 19-26, find the fifth term and the n...Ch. 12.3 - Prob. 21SBCh. 12.3 - Prob. 22SBCh. 12.3 - Prob. 23SBCh. 12.3 - Prob. 24SBCh. 12.3 - Prob. 25SBCh. 12.3 - Prob. 26SBCh. 12.3 - Prob. 27SBCh. 12.3 - Prob. 28SBCh. 12.3 - Prob. 29SBCh. 12.3 - Prob. 30SBCh. 12.3 - Prob. 31SBCh. 12.3 - Prob. 32SBCh. 12.3 - Prob. 33SBCh. 12.3 - Prob. 34SBCh. 12.3 - Prob. 35SBCh. 12.3 - Prob. 36SBCh. 12.3 - Prob. 37SBCh. 12.3 - Prob. 38SBCh. 12.3 - Prob. 39SBCh. 12.3 - Prob. 40SBCh. 12.3 - In problems 41-46, find each sum. 1 4 + 2 4 + 2 2...Ch. 12.3 - Prob. 42SBCh. 12.3 - In problems 41-46, find each sum. k=1 n ( 2 3 ) kCh. 12.3 - In problems 41-46, find each sum. k=1 n 4 3 k1Ch. 12.3 - Prob. 45SBCh. 12.3 - Prob. 46SBCh. 12.3 - Prob. 47SBCh. 12.3 - Prob. 48SBCh. 12.3 - Prob. 49SBCh. 12.3 - Prob. 50SBCh. 12.3 - Prob. 51SBCh. 12.3 - For Problems 47-52, use a graphing utility to find...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - Prob. 56SBCh. 12.3 - Prob. 57SBCh. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - Prob. 60SBCh. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - Prob. 63SBCh. 12.3 - Prob. 64SBCh. 12.3 - Prob. 65SBCh. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - In Problems 53-68, determine whether each infinite...Ch. 12.3 - Prob. 69MPCh. 12.3 - Prob. 70MPCh. 12.3 - Prob. 71MPCh. 12.3 - Prob. 72MPCh. 12.3 - In Problems 69-82, determine whether the given...Ch. 12.3 - Prob. 74MPCh. 12.3 - Prob. 75MPCh. 12.3 - Prob. 76MPCh. 12.3 - Prob. 77MPCh. 12.3 - Prob. 78MPCh. 12.3 - Prob. 79MPCh. 12.3 - Prob. 80MPCh. 12.3 - Prob. 81MPCh. 12.3 - Prob. 82MPCh. 12.3 - Prob. 83AECh. 12.3 - Prob. 84AECh. 12.3 - Salary Increases If you have been hired at an...Ch. 12.3 - Prob. 86AECh. 12.3 - Pendulum Swings Initially, a pendulum swings...Ch. 12.3 - Bouncing Balls A ball is dropped from a height of...Ch. 12.3 - Retirement Christine contributes 100 each month to...Ch. 12.3 - Saving for a Home Jolene wants to purchase a new...Ch. 12.3 - Tax-Sheltered Annuity Don contributes 500 at the...Ch. 12.3 - Retirement Ray contributes 1000 to an individual...Ch. 12.3 - Sinking Fund Scott and Alice want to purchase a...Ch. 12.3 - Prob. 94AECh. 12.3 - Prob. 95AECh. 12.3 - Prob. 96AECh. 12.3 - Prob. 97AECh. 12.3 - Multiplier Refer to Problem 97. Suppose that the...Ch. 12.3 - Prob. 99AECh. 12.3 - Stock Price Refer to Problem 99. Suppose that a...Ch. 12.3 - Prob. 101AECh. 12.3 - Show that the Amount of an Annuity formula that...Ch. 12.3 - Critical Thinking You are interviewing for a job...Ch. 12.3 - Prob. 104DWCh. 12.3 - Prob. 105DWCh. 12.3 - Prob. 106DWCh. 12.3 - Prob. 107DWCh. 12.3 - Prob. 108DWCh. 12.3 - Prob. 109DWCh. 12.3 - Describe the similarities and differences between...Ch. 12.3 - Use the ChangeofBase Formula and a calculator to...Ch. 12.3 - Prob. 113RYKCh. 12.3 - Prob. 114RYKCh. 12.3 - Prob. 115RYKCh. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 1-22, use the Principle of...Ch. 12.4 - In Problems 23-27, prove each statement. If x1 ,...Ch. 12.4 - In Problems 23-27, prove each statement. If 0x1 ,...Ch. 12.4 - In Problems 23-27, prove each statement. ab is a...Ch. 12.4 - In Problems 23-27, prove each statement. a+b is a...Ch. 12.4 - In Problems 23-27, prove each statement. ( 1+a ) n...Ch. 12.4 - Show that the statement n 2 n+41 is a prime...Ch. 12.4 - Show that the formula 2+4+6++2n= n 2 +n+2 obeys...Ch. 12.4 - Use mathematical induction to prove that if r1 ,...Ch. 12.4 - Use mathematical induction to prove that a+( a+d...Ch. 12.4 - Extended Principle of Mathematical Induction The...Ch. 12.4 - Geometry Use the Extended Principle of...Ch. 12.4 - How would you explain the Principle of...Ch. 12.4 - Solve: log 2 x+5 =4Ch. 12.4 - A mass of 500 kg is suspended from two cables, as...Ch. 12.4 - Solve the system: { 4x+3y=7 2x5y=16Ch. 12.4 - For A=[ 1 2 1 0 1 4 ]andB=[ 3 1 1 0 2 2 ] , find...Ch. 12.5 - The ______ ______ is a triangular display of the...Ch. 12.5 - ( n 0 )=and( n 1 )= .Ch. 12.5 - True or False ( n j )= j! ( nj )!n!Ch. 12.5 - The ______ ________ can be used to expand...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 5 3...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 7 3...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 7 5...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 9 7...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 50...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 100...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 1000...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 1000...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 55...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 60...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 47...Ch. 12.5 - In Problems 5-16, evaluate each expression. ( 37...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 17-28, expand each expression using...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - In Problems 29-42, use the Binomial Theorem to...Ch. 12.5 - Use the Binomial Theorem to find the numerical...Ch. 12.5 - Use the Binomial Theorem to find the numerical...Ch. 12.5 - Show that ( n n1 )=nand( n n )=1 .Ch. 12.5 - Show that if n and j arc integers with 0jn , then,...Ch. 12.5 - If n is a positive integer, show that, ( n 0 )+( n...Ch. 12.5 - If n is a positive integer, show that ( n 0 )( n 1...Ch. 12.5 - ( 5 0 ) ( 1 4 ) 5 +( 5 1 ) ( 1 4 ) 4 ( 3 4 )+( 5 2...Ch. 12.5 - Stirling’s Formula An approximation for n! ,...Ch. 12.5 - Solve 6 x = 5 x+1 . Express the answer both in...Ch. 12.5 - For v=2i+3jandw=3i2j (a) Find the dot product vw...Ch. 12.5 - Solve the system of equations: { xyz=0 2x+y+3z=1...Ch. 12.5 - Graph the system of inequalities. Tell whether the...
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- 4. Let F RNR be a mapping. (i) x ЄRN ? (ii) : What does it mean to say that F is differentiable at a point [1 Mark] In Theorem 5.4 in the Lecture Notes we proved that if F is differentiable at a point x E RN then F is continuous at x. Proof. Let (n) CRN be a sequence such that xn → x ЄERN as n → ∞. We want to show that F(xn) F(x), which means F is continuous at x. Denote hnxn - x, so that ||hn|| 0. Thus we find ||F(xn) − F(x)|| = ||F(x + hn) − F(x)|| * ||DF (x)hn + R(hn) || (**) ||DF(x)hn||+||R(hn)||| → 0, because the linear mapping DF(x) is continuous and for all large nЄ N, (***) ||R(hn) || ||R(hn) || ≤ → 0. ||hn|| (a) Explain in details why ||hn|| → 0. [3 Marks] (b) Explain the steps labelled (*), (**), (***). [6 Marks]arrow_forward4. In Theorem 5.4 in the Lecture Notes we proved that if F: RN → Rm is differentiable at x = RN then F is continuous at x. Proof. Let (xn) CRN be a sequence such that x → x Є RN as n → ∞. We want F(x), which means F is continuous at x. to show that F(xn) Denote hn xnx, so that ||hn||| 0. Thus we find ||F (xn) − F(x) || (*) ||F(x + hn) − F(x)|| = ||DF(x)hn + R(hn)|| (**) ||DF(x)hn|| + ||R(hn) || → 0, because the linear mapping DF(x) is continuous and for all large n = N, |||R(hn) || ≤ (***) ||R(hn)|| ||hn|| → 0. Explain the steps labelled (*), (**), (***) [6 Marks] (ii) Give an example of a function F: RR such that F is contin- Total marks 10 uous at x=0 but F is not differentiable at at x = 0. [4 Marks]arrow_forward3. Let f R2 R be a function. (i) Explain in your own words the relationship between the existence of all partial derivatives of f and differentiability of f at a point x = R². (ii) Consider R2 → R defined by : [5 Marks] f(x1, x2) = |2x1x2|1/2 Show that af af -(0,0) = 0 and -(0, 0) = 0, Jx1 მx2 but f is not differentiable at (0,0). [10 Marks]arrow_forward
- (1) Write the following quadratic equation in terms of the vertex coordinates.arrow_forwardThe final answer is 8/π(sinx) + 8/3π(sin 3x)+ 8/5π(sin5x)....arrow_forwardKeity x२ 1. (i) Identify which of the following subsets of R2 are open and which are not. (a) A = (2,4) x (1, 2), (b) B = (2,4) x {1,2}, (c) C = (2,4) x R. Provide a sketch and a brief explanation to each of your answers. [6 Marks] (ii) Give an example of a bounded set in R2 which is not open. [2 Marks] (iii) Give an example of an open set in R2 which is not bounded. [2 Marksarrow_forward
- 2. (i) Which of the following statements are true? Construct coun- terexamples for those that are false. (a) sequence. Every bounded sequence (x(n)) nEN C RN has a convergent sub- (b) (c) (d) Every sequence (x(n)) nEN C RN has a convergent subsequence. Every convergent sequence (x(n)) nEN C RN is bounded. Every bounded sequence (x(n)) EN CRN converges. nЄN (e) If a sequence (xn)nEN C RN has a convergent subsequence, then (xn)nEN is convergent. [10 Marks] (ii) Give an example of a sequence (x(n))nEN CR2 which is located on the parabola x2 = x², contains infinitely many different points and converges to the limit x = (2,4). [5 Marks]arrow_forward2. (i) What does it mean to say that a sequence (x(n)) nEN CR2 converges to the limit x E R²? [1 Mark] (ii) Prove that if a set ECR2 is closed then every convergent sequence (x(n))nen in E has its limit in E, that is (x(n)) CE and x() x x = E. [5 Marks] (iii) which is located on the parabola x2 = = x x4, contains a subsequence that Give an example of an unbounded sequence (r(n)) nEN CR2 (2, 16) and such that x(i) converges to the limit x = (2, 16) and such that x(i) # x() for any i j. [4 Marksarrow_forward1. (i) which are not. Identify which of the following subsets of R2 are open and (a) A = (1, 3) x (1,2) (b) B = (1,3) x {1,2} (c) C = AUB (ii) Provide a sketch and a brief explanation to each of your answers. [6 Marks] Give an example of a bounded set in R2 which is not open. (iii) [2 Marks] Give an example of an open set in R2 which is not bounded. [2 Marks]arrow_forward
- 2. if limit. Recall that a sequence (x(n)) CR2 converges to the limit x = R² lim ||x(n)x|| = 0. 818 - (i) Prove that a convergent sequence (x(n)) has at most one [4 Marks] (ii) Give an example of a bounded sequence (x(n)) CR2 that has no limit and has accumulation points (1, 0) and (0, 1) [3 Marks] (iii) Give an example of a sequence (x(n))neN CR2 which is located on the hyperbola x2 1/x1, contains infinitely many different Total marks 10 points and converges to the limit x = (2, 1/2). [3 Marks]arrow_forward3. (i) Consider a mapping F: RN Rm. Explain in your own words the relationship between the existence of all partial derivatives of F and dif- ferentiability of F at a point x = RN. (ii) [3 Marks] Calculate the gradient of the following function f: R2 → R, f(x) = ||x||3, Total marks 10 where ||x|| = √√√x² + x/2. [7 Marks]arrow_forward1. (i) (ii) which are not. What does it mean to say that a set ECR2 is closed? [1 Mark] Identify which of the following subsets of R2 are closed and (a) A = [-1, 1] × (1, 3) (b) B = [-1, 1] x {1,3} (c) C = {(1/n², 1/n2) ER2 | n EN} Provide a sketch and a brief explanation to each of your answers. [6 Marks] (iii) Give an example of a closed set which does not have interior points. [3 Marks]arrow_forward
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