Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 11 - Section 11.4 - The Binomial Theorem - Exercise Set - Page 865: 44

Answer

$56x^9y^{10}$

Work Step by Step

Our aim is to find the sixith term for $(x^3+y^2)^{8}$. General formula:$(p+q)^n=\displaystyle \binom{n}{k}p^{n-k}q^k$ and $\displaystyle \binom{n}{k}=\dfrac{n!}{k!(n-k)!}$ Now, $(x^3+y^2)^{8}=\displaystyle \binom{8}{3}(x^3)^{8-5}(y^2)^5$ This implies, $=\dfrac{8!}{5!(8-5)!}(x)^{9}(y)^{10}$ $=\dfrac{ 8 \times 7 \times 6 \times 5 \times 4 \times 3!}{5 \times 4 \times 3 \times 2 \times 1(3!)}(x)^{9}y^{10}$ Thus, $=56x^9y^{10}$
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