Intermediate Algebra for College Students (7th Edition)

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

Chapter 5 - Section 5.2 - Multiplication of Polynomials - Exercise Set - Page 338: 91

Answer

$x^2+y^2+2xy+2x+2x+1$

Work Step by Step

The product of a binomial sum and a binomial difference is: $(A+B)(A-B)=A^2-B^2$. The square of a binomial sum is: $(A+B)^2=A^2+2AB+B^2$. The square of a binomial difference is: $(A-B)^2=A^2-2AB+B^2$. Hence here: $[(x+y)+1)]^2=(x+y)^2+2(x+y)+1^2=x^2+y^2+2\cdot x\cdot y+2x+2x+1^2=x^2+y^2+2xy+2x+2x+1$
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