Precalculus
11th Edition
ISBN: 9780135189405
Author: Michael Sullivan
Publisher: PEARSON
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Question
Chapter A.2, Problem 8AYU
To determine
To fill: The triangle with sides of lengths 6, 8, and 10 is a right triangle.
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Students have asked these similar questions
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 A Solutions
Precalculus
Ch. A.1 - Prob. 1AYUCh. A.1 - Prob. 2AYUCh. A.1 - Prob. 3AYUCh. A.1 - Prob. 4AYUCh. A.1 - Prob. 5AYUCh. A.1 - Prob. 6AYUCh. A.1 - Prob. 7AYUCh. A.1 - Prob. 8AYUCh. A.1 - Prob. 9AYUCh. A.1 - Prob. 10AYU
Ch. A.1 - Prob. 11AYUCh. A.1 - Prob. 12AYUCh. A.1 - Prob. 13AYUCh. A.1 - Prob. 14AYUCh. A.1 - Prob. 15AYUCh. A.1 - Prob. 16AYUCh. A.1 - Prob. 17AYUCh. A.1 - Prob. 18AYUCh. A.1 - Prob. 19AYUCh. A.1 - Prob. 20AYUCh. A.1 - Prob. 21AYUCh. A.1 - Prob. 22AYUCh. A.1 - Prob. 23AYUCh. A.1 - Prob. 24AYUCh. A.1 - Prob. 25AYUCh. A.1 - Prob. 26AYUCh. A.1 - Prob. 27AYUCh. A.1 - Prob. 28AYUCh. A.1 - Prob. 29AYUCh. A.1 - Prob. 30AYUCh. A.1 - Prob. 31AYUCh. A.1 - Prob. 32AYUCh. A.1 - Prob. 33AYUCh. A.1 - Prob. 34AYUCh. A.1 - Prob. 35AYUCh. A.1 - Prob. 36AYUCh. A.1 - Prob. 37AYUCh. A.1 - Prob. 38AYUCh. A.1 - Prob. 39AYUCh. A.1 - Prob. 40AYUCh. A.1 - Prob. 41AYUCh. A.1 - Prob. 42AYUCh. A.1 - Prob. 43AYUCh. A.1 - Prob. 44AYUCh. A.1 - Prob. 45AYUCh. A.1 - Prob. 46AYUCh. A.1 - Prob. 47AYUCh. A.1 - Prob. 48AYUCh. A.1 - Prob. 49AYUCh. A.1 - Prob. 50AYUCh. A.1 - Prob. 51AYUCh. A.1 - Prob. 52AYUCh. A.1 - Prob. 53AYUCh. A.1 - Prob. 54AYUCh. A.1 - Prob. 55AYUCh. A.1 - Prob. 56AYUCh. A.1 - Prob. 57AYUCh. A.1 - Prob. 58AYUCh. A.1 - Prob. 59AYUCh. A.1 - Prob. 60AYUCh. A.1 - Prob. 61AYUCh. A.1 - Prob. 62AYUCh. A.1 - Prob. 63AYUCh. A.1 - Prob. 64AYUCh. A.1 - Prob. 65AYUCh. A.1 - Prob. 66AYUCh. A.1 - Prob. 67AYUCh. A.1 - Prob. 68AYUCh. A.1 - Prob. 69AYUCh. A.1 - Prob. 70AYUCh. A.1 - Prob. 71AYUCh. A.1 - Prob. 72AYUCh. A.1 - Prob. 73AYUCh. A.1 - Prob. 74AYUCh. A.1 - Prob. 75AYUCh. A.1 - Prob. 76AYUCh. A.1 - Prob. 77AYUCh. A.1 - Prob. 78AYUCh. A.1 - Prob. 79AYUCh. A.1 - Prob. 80AYUCh. A.1 - Prob. 81AYUCh. A.1 - Prob. 82AYUCh. A.1 - Prob. 83AYUCh. A.1 - Prob. 84AYUCh. A.1 - Prob. 85AYUCh. A.1 - Prob. 86AYUCh. A.1 - Prob. 87AYUCh. A.1 - Prob. 88AYUCh. A.1 - Prob. 89AYUCh. A.1 - Prob. 90AYUCh. A.1 - Prob. 91AYUCh. A.1 - Prob. 92AYUCh. A.1 - Prob. 93AYUCh. A.1 - Prob. 94AYUCh. A.1 - Prob. 95AYUCh. A.1 - Prob. 96AYUCh. A.1 - Prob. 97AYUCh. A.1 - Prob. 98AYUCh. A.1 - Prob. 99AYUCh. A.1 - Prob. 100AYUCh. A.1 - Prob. 101AYUCh. A.1 - Prob. 102AYUCh. A.1 - Prob. 103AYUCh. A.1 - Prob. 104AYUCh. A.1 - Prob. 105AYUCh. A.1 - Prob. 106AYUCh. A.1 - Prob. 107AYUCh. A.1 - Prob. 108AYUCh. A.1 - Prob. 109AYUCh. A.1 - Prob. 110AYUCh. A.1 - Prob. 111AYUCh. A.1 - Prob. 112AYUCh. A.1 - Prob. 113AYUCh. A.1 - Prob. 114AYUCh. A.1 - Prob. 115AYUCh. A.1 - Prob. 116AYUCh. A.1 - Prob. 117AYUCh. A.1 - Prob. 118AYUCh. A.1 - Prob. 119AYUCh. A.1 - Prob. 120AYUCh. A.1 - Prob. 121AYUCh. A.1 - Prob. 122AYUCh. A.1 - Prob. 123AYUCh. A.1 - Prob. 124AYUCh. A.1 - Prob. 125AYUCh. A.1 - Prob. 126AYUCh. A.1 - Prob. 127AYUCh. A.1 - Prob. 128AYUCh. A.1 - Prob. 129AYUCh. A.1 - Prob. 130AYUCh. A.1 - Prob. 131AYUCh. A.1 - Prob. 132AYUCh. A.1 - Prob. 133AYUCh. A.1 - Prob. 134AYUCh. A.1 - Prob. 135AYUCh. A.1 - Prob. 136AYUCh. A.1 - Prob. 137AYUCh. A.1 - Prob. 138AYUCh. A.1 - Prob. 139AYUCh. A.1 - Prob. 140AYUCh. A.1 - Prob. 141AYUCh. A.1 - Prob. 142AYUCh. A.1 - Prob. 143AYUCh. A.1 - Prob. 144AYUCh. A.1 - Prob. 145AYUCh. A.1 - Prob. 146AYUCh. A.1 - Prob. 147AYUCh. A.1 - Prob. 148AYUCh. A.1 - Prob. 149AYUCh. A.1 - Prob. 150AYUCh. A.1 - Prob. 151AYUCh. A.1 - Prob. 152AYUCh. A.1 - Prob. 153AYUCh. A.1 - Prob. 154AYUCh. A.2 - Prob. 1AYUCh. A.2 - Prob. 2AYUCh. A.2 - Prob. 3AYUCh. A.2 - Prob. 4AYUCh. A.2 - Prob. 5AYUCh. A.2 - Prob. 6AYUCh. A.2 - Prob. 7AYUCh. A.2 - Prob. 8AYUCh. A.2 - Prob. 9AYUCh. A.2 - Prob. 10AYUCh. A.2 - Prob. 11AYUCh. A.2 - Prob. 12AYUCh. A.2 - Prob. 13AYUCh. A.2 - Prob. 14AYUCh. A.2 - Prob. 15AYUCh. A.2 - Prob. 16AYUCh. A.2 - Prob. 17AYUCh. A.2 - Prob. 18AYUCh. A.2 - Prob. 19AYUCh. A.2 - Prob. 20AYUCh. A.2 - Prob. 21AYUCh. A.2 - Prob. 22AYUCh. A.2 - Prob. 23AYUCh. A.2 - Prob. 24AYUCh. A.2 - Prob. 25AYUCh. A.2 - Prob. 26AYUCh. A.2 - Prob. 27AYUCh. A.2 - Prob. 28AYUCh. A.2 - Prob. 29AYUCh. A.2 - Prob. 30AYUCh. A.2 - Prob. 31AYUCh. A.2 - Prob. 32AYUCh. A.2 - Prob. 33AYUCh. A.2 - Prob. 34AYUCh. A.2 - Prob. 35AYUCh. A.2 - Prob. 36AYUCh. A.2 - Prob. 37AYUCh. A.2 - Prob. 38AYUCh. A.2 - Prob. 39AYUCh. A.2 - Prob. 40AYUCh. A.2 - Prob. 41AYUCh. A.2 - Prob. 42AYUCh. A.2 - Prob. 43AYUCh. A.2 - Prob. 44AYUCh. A.2 - Prob. 45AYUCh. A.2 - Prob. 46AYUCh. A.2 - Prob. 47AYUCh. A.2 - Prob. 48AYUCh. A.2 - Prob. 49AYUCh. A.2 - Prob. 50AYUCh. A.2 - Prob. 51AYUCh. A.2 - Prob. 52AYUCh. A.2 - Prob. 53AYUCh. A.2 - Prob. 54AYUCh. A.2 - Prob. 55AYUCh. A.2 - Prob. 56AYUCh. A.2 - Prob. 57AYUCh. A.2 - Prob. 58AYUCh. A.2 - Prob. 59AYUCh. A.2 - Prob. 60AYUCh. A.2 - Prob. 61AYUCh. A.2 - Prob. 62AYUCh. A.3 - Prob. 1AYUCh. A.3 - Prob. 2AYUCh. A.3 - Prob. 3AYUCh. A.3 - Prob. 4AYUCh. A.3 - Prob. 5AYUCh. A.3 - Prob. 6AYUCh. A.3 - Prob. 7AYUCh. A.3 - Prob. 8AYUCh. A.3 - Prob. 9AYUCh. A.3 - Prob. 10AYUCh. A.3 - Prob. 11AYUCh. A.3 - Prob. 12AYUCh. A.3 - Prob. 13AYUCh. A.3 - Prob. 14AYUCh. A.3 - Prob. 15AYUCh. A.3 - Prob. 16AYUCh. A.3 - Prob. 17AYUCh. A.3 - Prob. 18AYUCh. A.3 - Prob. 19AYUCh. A.3 - Prob. 20AYUCh. A.3 - Prob. 21AYUCh. A.3 - Prob. 22AYUCh. A.3 - Prob. 23AYUCh. A.3 - Prob. 24AYUCh. A.3 - Prob. 25AYUCh. A.3 - Prob. 26AYUCh. A.3 - Prob. 27AYUCh. A.3 - Prob. 28AYUCh. A.3 - Prob. 29AYUCh. A.3 - Prob. 30AYUCh. A.3 - Prob. 31AYUCh. A.3 - Prob. 32AYUCh. A.3 - Prob. 33AYUCh. A.3 - Prob. 34AYUCh. A.3 - Prob. 35AYUCh. A.3 - Prob. 36AYUCh. A.3 - Prob. 37AYUCh. A.3 - Prob. 38AYUCh. A.3 - Prob. 39AYUCh. A.3 - Prob. 40AYUCh. A.3 - Prob. 41AYUCh. A.3 - Prob. 42AYUCh. A.3 - Prob. 43AYUCh. A.3 - Prob. 44AYUCh. A.3 - Prob. 45AYUCh. A.3 - Prob. 46AYUCh. A.3 - Prob. 47AYUCh. A.3 - Prob. 48AYUCh. A.3 - Prob. 49AYUCh. A.3 - Prob. 50AYUCh. A.3 - Prob. 51AYUCh. A.3 - Prob. 52AYUCh. A.3 - Prob. 53AYUCh. A.3 - Prob. 54AYUCh. A.3 - Prob. 55AYUCh. A.3 - Prob. 56AYUCh. A.3 - Prob. 57AYUCh. A.3 - Prob. 58AYUCh. A.3 - Prob. 59AYUCh. A.3 - Prob. 60AYUCh. A.3 - Prob. 61AYUCh. A.3 - Prob. 62AYUCh. A.3 - Prob. 63AYUCh. A.3 - Prob. 64AYUCh. A.3 - Prob. 65AYUCh. A.3 - Prob. 66AYUCh. A.3 - Prob. 67AYUCh. A.3 - Prob. 68AYUCh. A.3 - Prob. 69AYUCh. A.3 - Prob. 70AYUCh. A.3 - Prob. 71AYUCh. A.3 - Prob. 72AYUCh. A.3 - Prob. 73AYUCh. A.3 - Prob. 74AYUCh. A.3 - Prob. 75AYUCh. A.3 - Prob. 76AYUCh. A.3 - Prob. 77AYUCh. A.3 - Prob. 78AYUCh. A.3 - Prob. 79AYUCh. A.3 - Prob. 80AYUCh. A.3 - Prob. 81AYUCh. A.3 - Prob. 82AYUCh. A.3 - Prob. 83AYUCh. A.3 - Prob. 84AYUCh. A.3 - Prob. 85AYUCh. A.3 - Prob. 86AYUCh. A.3 - Prob. 87AYUCh. A.3 - Prob. 88AYUCh. A.3 - Prob. 89AYUCh. A.3 - Prob. 90AYUCh. A.3 - Prob. 91AYUCh. A.3 - Prob. 92AYUCh. A.3 - Prob. 93AYUCh. A.3 - Prob. 94AYUCh. A.3 - Prob. 95AYUCh. A.3 - Prob. 96AYUCh. A.3 - Prob. 97AYUCh. A.3 - Prob. 98AYUCh. A.3 - Prob. 99AYUCh. A.3 - Prob. 100AYUCh. A.3 - Prob. 101AYUCh. A.3 - Prob. 102AYUCh. A.3 - Prob. 103AYUCh. A.3 - Prob. 104AYUCh. A.3 - Prob. 105AYUCh. A.3 - Prob. 106AYUCh. A.3 - Prob. 107AYUCh. A.3 - Prob. 108AYUCh. A.3 - Prob. 109AYUCh. A.3 - Prob. 110AYUCh. A.3 - Prob. 111AYUCh. A.3 - Prob. 112AYUCh. A.3 - Prob. 113AYUCh. A.3 - Prob. 114AYUCh. A.3 - Prob. 115AYUCh. A.3 - Prob. 116AYUCh. A.3 - Prob. 117AYUCh. A.3 - Prob. 118AYUCh. A.3 - Prob. 119AYUCh. A.3 - Prob. 120AYUCh. A.3 - Prob. 121AYUCh. A.3 - Prob. 122AYUCh. A.3 - Prob. 123AYUCh. A.3 - Prob. 124AYUCh. A.3 - Prob. 125AYUCh. A.3 - Prob. 126AYUCh. A.3 - Prob. 127AYUCh. A.3 - Prob. 128AYUCh. A.3 - Prob. 129AYUCh. A.3 - Prob. 130AYUCh. A.3 - Prob. 131AYUCh. A.3 - Prob. 132AYUCh. A.3 - Prob. 133AYUCh. A.3 - Prob. 134AYUCh. A.3 - Prob. 135AYUCh. A.3 - Prob. 136AYUCh. A.3 - Prob. 137AYUCh. A.3 - Prob. 138AYUCh. A.3 - Prob. 139AYUCh. A.3 - Prob. 140AYUCh. A.3 - Prob. 141AYUCh. A.3 - Prob. 142AYUCh. A.3 - Prob. 143AYUCh. A.3 - Prob. 144AYUCh. A.3 - Prob. 145AYUCh. A.3 - Prob. 146AYUCh. A.3 - Prob. 147AYUCh. A.3 - Prob. 148AYUCh. A.4 - Prob. 1AYUCh. A.4 - Prob. 2AYUCh. A.4 - Prob. 3AYUCh. A.4 - Prob. 4AYUCh. A.4 - Prob. 5AYUCh. A.4 - Prob. 6AYUCh. A.4 - Prob. 7AYUCh. A.4 - Prob. 8AYUCh. A.4 - Prob. 9AYUCh. A.4 - Prob. 10AYUCh. A.4 - Prob. 11AYUCh. A.4 - Prob. 12AYUCh. A.4 - Prob. 13AYUCh. A.4 - Prob. 14AYUCh. A.4 - Prob. 15AYUCh. A.4 - Prob. 16AYUCh. A.4 - Prob. 17AYUCh. A.4 - Prob. 18AYUCh. A.4 - Prob. 19AYUCh. A.4 - Prob. 20AYUCh. A.4 - Prob. 21AYUCh. A.4 - Prob. 22AYUCh. A.4 - Prob. 23AYUCh. A.4 - Prob. 24AYUCh. A.4 - Prob. 25AYUCh. A.4 - Prob. 26AYUCh. A.4 - Prob. 27AYUCh. A.4 - Prob. 28AYUCh. A.4 - Prob. 29AYUCh. A.4 - Prob. 30AYUCh. A.5 - Prob. 1AYUCh. A.5 - Prob. 2AYUCh. A.5 - Prob. 3AYUCh. A.5 - Prob. 4AYUCh. A.5 - Prob. 5AYUCh. A.5 - Prob. 6AYUCh. A.5 - Prob. 7AYUCh. A.5 - Prob. 8AYUCh. A.5 - Prob. 9AYUCh. A.5 - Prob. 10AYUCh. A.5 - Prob. 11AYUCh. A.5 - Prob. 12AYUCh. A.5 - Prob. 13AYUCh. A.5 - Prob. 14AYUCh. A.5 - Prob. 15AYUCh. A.5 - Prob. 16AYUCh. A.5 - Prob. 17AYUCh. A.5 - Prob. 18AYUCh. A.5 - Prob. 19AYUCh. A.5 - Prob. 20AYUCh. A.5 - Prob. 21AYUCh. A.5 - Prob. 22AYUCh. A.5 - Prob. 23AYUCh. A.5 - Prob. 24AYUCh. A.5 - Prob. 25AYUCh. A.5 - Prob. 26AYUCh. A.5 - Prob. 27AYUCh. A.5 - Prob. 28AYUCh. A.5 - Prob. 29AYUCh. A.5 - Prob. 30AYUCh. A.5 - Prob. 31AYUCh. A.5 - Prob. 32AYUCh. A.5 - Prob. 33AYUCh. A.5 - Prob. 34AYUCh. A.5 - Prob. 35AYUCh. A.5 - Prob. 36AYUCh. A.5 - Prob. 37AYUCh. A.5 - Prob. 38AYUCh. A.5 - Prob. 39AYUCh. A.5 - Prob. 40AYUCh. A.5 - Prob. 41AYUCh. A.5 - Prob. 42AYUCh. A.5 - Prob. 43AYUCh. A.5 - Prob. 44AYUCh. A.5 - Prob. 45AYUCh. A.5 - Prob. 46AYUCh. A.5 - Prob. 47AYUCh. A.5 - Prob. 48AYUCh. A.5 - Prob. 49AYUCh. A.6 - Factor:
Ch. A.6 - Prob. 2AYUCh. A.6 - Prob. 3AYUCh. A.6 - Prob. 4AYUCh. A.6 - Prob. 5AYUCh. A.6 - Prob. 6AYUCh. A.6 - Prob. 7AYUCh. A.6 - To solve the equation by completing the square,...Ch. A.6 - Prob. 9AYUCh. A.6 - Prob. 10AYUCh. A.6 - Prob. 11AYUCh. A.6 - Prob. 12AYUCh. A.6 - Prob. 13AYUCh. A.6 - Prob. 14AYUCh. A.6 - Prob. 15AYUCh. A.6 - Prob. 16AYUCh. A.6 - Prob. 17AYUCh. A.6 - Prob. 18AYUCh. A.6 - Prob. 19AYUCh. A.6 - Prob. 20AYUCh. A.6 - Prob. 21AYUCh. A.6 - Prob. 22AYUCh. A.6 - Prob. 23AYUCh. A.6 - Prob. 24AYUCh. A.6 - Prob. 25AYUCh. A.6 - Prob. 26AYUCh. A.6 - Prob. 27AYUCh. A.6 - Prob. 28AYUCh. A.6 - Prob. 29AYUCh. A.6 - Prob. 30AYUCh. A.6 - Prob. 31AYUCh. A.6 - Prob. 32AYUCh. A.6 - Prob. 33AYUCh. A.6 - Prob. 34AYUCh. A.6 - Prob. 35AYUCh. A.6 - Prob. 36AYUCh. A.6 - Prob. 37AYUCh. A.6 - Prob. 38AYUCh. A.6 - Prob. 39AYUCh. A.6 - Prob. 40AYUCh. A.6 - Prob. 41AYUCh. A.6 - Prob. 42AYUCh. A.6 - Prob. 43AYUCh. A.6 - Prob. 44AYUCh. A.6 - In Problems , solve each equation.
Ch. A.6 - Prob. 46AYUCh. A.6 - Prob. 47AYUCh. A.6 - Prob. 48AYUCh. A.6 - Prob. 49AYUCh. A.6 - Prob. 50AYUCh. A.6 - Prob. 51AYUCh. A.6 - Prob. 52AYUCh. A.6 - Prob. 53AYUCh. A.6 - Prob. 54AYUCh. A.6 - Prob. 55AYUCh. A.6 - Prob. 56AYUCh. A.6 - Prob. 57AYUCh. A.6 - Prob. 58AYUCh. A.6 - Prob. 59AYUCh. A.6 - Prob. 60AYUCh. A.6 - Prob. 61AYUCh. A.6 - Prob. 62AYUCh. A.6 - Prob. 63AYUCh. A.6 - Prob. 64AYUCh. A.6 - Prob. 65AYUCh. A.6 - Prob. 66AYUCh. A.6 - Prob. 67AYUCh. A.6 - Prob. 68AYUCh. A.6 - Prob. 69AYUCh. A.6 - Prob. 70AYUCh. A.6 - Prob. 71AYUCh. A.6 - Prob. 72AYUCh. A.6 - Prob. 73AYUCh. A.6 - Prob. 74AYUCh. A.6 - Prob. 75AYUCh. A.6 - Prob. 76AYUCh. A.6 - Prob. 77AYUCh. A.6 - Prob. 78AYUCh. A.6 - Prob. 79AYUCh. A.6 - Prob. 80AYUCh. A.6 - Prob. 81AYUCh. A.6 - Prob. 82AYUCh. A.6 - Prob. 83AYUCh. A.6 - Prob. 84AYUCh. A.6 - Prob. 85AYUCh. A.6 - Prob. 86AYUCh. A.6 - Prob. 87AYUCh. A.6 - Prob. 88AYUCh. A.6 - Prob. 89AYUCh. A.6 - Prob. 90AYUCh. A.6 - Prob. 91AYUCh. A.6 - Prob. 92AYUCh. A.6 - Prob. 93AYUCh. A.6 - Prob. 94AYUCh. A.6 - Prob. 95AYUCh. A.6 - Prob. 96AYUCh. A.6 - Prob. 97AYUCh. A.6 - Prob. 98AYUCh. A.6 - Prob. 99AYUCh. A.6 - Prob. 100AYUCh. A.6 - Prob. 101AYUCh. A.6 - Prob. 102AYUCh. A.6 - Prob. 103AYUCh. A.6 - Prob. 104AYUCh. A.6 - Prob. 105AYUCh. A.6 - Prob. 106AYUCh. A.6 - Prob. 107AYUCh. A.6 - Prob. 108AYUCh. A.6 - Prob. 109AYUCh. A.6 - Prob. 110AYUCh. A.6 - Prob. 111AYUCh. A.6 - Prob. 112AYUCh. A.6 - Prob. 113AYUCh. A.6 - Prob. 114AYUCh. A.6 - Prob. 115AYUCh. A.6 - Prob. 116AYUCh. A.6 - Prob. 117AYUCh. A.6 - Prob. 118AYUCh. A.6 - Prob. 119AYUCh. A.6 - Prob. 120AYUCh. A.6 - Prob. 121AYUCh. A.6 - Prob. 122AYUCh. A.6 - Prob. 123AYUCh. A.6 - Prob. 124AYUCh. A.6 - Prob. 125AYUCh. A.6 - Prob. 126AYUCh. A.6 - Prob. 127AYUCh. A.6 - Prob. 128AYUCh. A.6 - Prob. 129AYUCh. A.6 - Prob. 130AYUCh. A.6 - Prob. 131AYUCh. A.6 - Prob. 132AYUCh. A.6 - Prob. 133AYUCh. A.6 - Prob. 134AYUCh. A.6 - Prob. 135AYUCh. A.7 - Prob. 1AYUCh. A.7 - Prob. 2AYUCh. A.7 - Prob. 3AYUCh. 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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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