Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

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: 61


$ x^2-2y^2-x y$

Work Step by Step

By using the FOIL (First, Outer, Inner, Last) method of multiplying two binomials, we have $$ (x - 2y)(x + y)= x^2+xy-2xy-2y^2 \\ = x^2-2y^2-x y .$$
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