Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 5 - Review: 99

Answer

$x^3+21x^2+147x+343$

Work Step by Step

$(x+7)^3$ $(x+7)(x+7)(x+7)$ $[(x+7)(x+7)](x+7)$ $[x(x+7)+7(x+7)](x+7)$ $[x^2+7x+7x+49](x+7)$ $(x^2+14x+49)(x+7)$ $x(x^2+14x+49)+7(x^2+14x+49)$ $(x^3+14x^2+49x)+(7x^2+98x+343)$ $x^3+21x^2+147x+343$
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