Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.4 - Polynomials - Exercise Set: 50

Answer

$81-90x+25x^2$

Work Step by Step

RECALL: $(a-b)^2=a^2-2ab+b^2$ Use the formula above with $a=9$ and $b=5x$ to obtain: $=9^2-2(9)(5x) +(5x)^2 \\=81-90x+25x^2$
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