Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 8 - Polynomials and Factoring - 8-8 Factoring by Grouping - Practice and Problem-Solving Exercises - Page 533: 53



Work Step by Step

$64x^{2}-144x+81=$ ...write first and last terms as squares. $=(8x)^{2}-144x+(9)^{2}$ ...does middle term equal $2ab$? $144x=2\cdot(8x)\cdot(9)$ $=(8x)^{2}-2\cdot(8x)\cdot(9)+(9)^{2}$ ...write as the square of a binomial. $=(8x-9)^{2}$
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