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: 83



Work Step by Step

We square (expand) the binomial to obtain: $$ (x - 2y)^2= (x-2y)(x-2y)=x^2+2\cdot x \cdot (-2y)+(-2y)^2=x^2-4xy+4y^2 .$$
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