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: 84



Work Step by Step

We square (expand) the binomial to obtain: $$ (2x +3y)^2=(2x+3y)(2x+3y)=(2 x)^2+2\cdot (2x )\cdot (3y)+(3y)^2=4x^2+12xy+9y^2 .$$
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