Calculus for Business Economics Life Sciences and Social Sciences Plus NEW
13th Edition
ISBN: 9780321925138
Author: Raymond Barnett
Publisher: PEARSON
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Textbook Question
Chapter B.2, Problem 38E
Show that the sum of the first n even positive integers is n + n2, using formulas in this section.
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7. Show that for R sufficiently large, the polynomial P(z) in Example 3, Sec. 5, satisfies
the inequality
|P(z)| R.
Suggestion: Observe that there is a positive number R such that the modulus of
each quotient in inequality (9), Sec. 5, is less than |an|/n when |z| > R.
9. Establish the identity
1-
1+z+z² +
2n+1
...
+z" =
1- z
(z1)
and then use it to derive Lagrange's trigonometric identity:
1
1+ cos cos 20 +... + cos no =
+
2
sin[(2n+1)0/2]
2 sin(0/2)
(0 < 0 < 2л).
Suggestion: As for the first identity, write S = 1+z+z² +...+z" and consider
the difference S - zS. To derive the second identity, write z =
eie in the first one.
8. Prove that two nonzero complex numbers z₁ and Z2 have the same moduli if and only if
there are complex numbers c₁ and c₂ such that Z₁ = c₁C2 and Z2 = c1c2.
Suggestion: Note that
(i≤
exp (101+0) exp (01-02)
and [see Exercise 2(b)]
2
02
Ꮎ
-
= = exp(i01)
exp(101+0) exp (i 01 - 02 ) = exp(102).
i
2
2
Chapter B.2 Solutions
Calculus for Business Economics Life Sciences and Social Sciences Plus NEW
Ch. B.2 - Which of the following can be the first four terms...Ch. B.2 - (A)If the 1st and 15th terms of an arithmetic...Ch. B.2 - Prob. 3MPCh. B.2 - MATCHED PROBLEM 4 Find the sum of all the odd...Ch. B.2 - Find the sum of the first eight terms of the...Ch. B.2 - Repeat Example 6 with a loan of 6,000 over 5...Ch. B.2 - Repeat Example 7 with a tax rebate of 2,000....Ch. B.2 - In Problems 1 and 2, determine whether the...Ch. B.2 - In Problems 1 and 2, determine whether the...Ch. B.2 - In Problems 38, determine whether the finite...
Ch. B.2 - In Problems 38, determine whether the finite...Ch. B.2 - Prob. 5ECh. B.2 - In Problems 38, determine whether the finite...Ch. B.2 - In Problems 38, determine whether the finite...Ch. B.2 - In Problems 38, determine whether the finite...Ch. B.2 - Let a1, a2, a3, , an, be an arithmetic sequence....Ch. B.2 - Let a1, a2, a3, , an, be an arithmetic sequence....Ch. B.2 - Prob. 11ECh. B.2 - Let a1, a2, a3, , an, be an arithmetic sequence....Ch. B.2 - Let a1, a2, a3, , an, be an arithmetic sequence....Ch. B.2 - Prob. 14ECh. B.2 - Prob. 15ECh. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - Prob. 17ECh. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - Prob. 19ECh. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - Prob. 23ECh. B.2 - Let a1, a2, a3, , an, be a geometric sequence. In...Ch. B.2 - S41=k=141(3k+3)=?Ch. B.2 - Prob. 26ECh. B.2 - S8=k=18(2)k1=?Ch. B.2 - S8=k=182k=?Ch. B.2 - Find the sum of all the odd integers between 12...Ch. B.2 - Find the sum of all the even integers between 23...Ch. B.2 - Find the sum of each infinite geometric sequence...Ch. B.2 - Repeat Problem 31 for: (A)16, 4, 1, (B)1, 3, 9, ...Ch. B.2 - Find f(1)+f(2)+f(3)++f(50) if f(x) = 2x 3.Ch. B.2 - Find g(1)+g(2)+g(3)++g(100) if g(t) = 18 3t.Ch. B.2 - Find f(1)+f(2)++f(10) if f(x)=(12)x.Ch. B.2 - Find g(1)+g(2)++g(10) if g(x) = 2x.Ch. B.2 - Prob. 37ECh. B.2 - Show that the sum of the first n even positive...Ch. B.2 - If r = 1, neither the first form nor the second...Ch. B.2 - Prob. 40ECh. B.2 - Does there exist a finite arithmetic series with...Ch. B.2 - Does there exist a finite arithmetic series with...Ch. B.2 - Does there exist a infinite geometric series with...Ch. B.2 - Does there exist an infinite geometric series with...Ch. B.2 - Loan repayment. If you borrow 4,800 and repay the...Ch. B.2 - Loan repayment. If you borrow 5,400 and repay the...Ch. B.2 - Economy stimulation. The government, through a...Ch. B.2 - Economy stimulation. Due to reduced taxes, a...Ch. B.2 - Compound interest. If 1,000 is invested at 5%...Ch. B.2 - Compound interest. If P is invested at 100r%...
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