Answer
$ x^2-y^2$
Work Step by Step
We distribute to obtain:
$$
(x + y)(x - y)= x^2-xy+xy-y^2=x^2-y^2
.$$
Note that this is the difference of two squares formula:
$(a-b)(a+b)=a^2-b^2$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.3 Polynomials - A.3 Assess Your Understanding - Page A31: 77
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