Algebra: A Combined Approach (4th Edition)

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

Chapter 6 - Section 6.5 - Factoring by Special Products - Exercise Set: 45

Answer

$(x - 3) (x+3)(x^2 +9)$

Work Step by Step

$x^4 - 81 = (x^2)^2 - (9)^2 = (x^2 - 9) (x^2 +9) = ((x)^2 - 3^2)(x^2 + 9) = (x - 3) (x+3)(x^2 +9)$
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