Answer
Since $P(c)=0$ it indeed factors as shown.
Work Step by Step
Plugging in 3,
$81+81-144-81+63 = 0$
Plugging in -3,
$81-81-144+81+63=0$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 3, Polynomial and Rational Functions - Section 3.3 - Dividing Polynomials - 3.3 Exercises - Page 310: 56
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