Answer
$-x^4+8x^3-25x^2+72x-144$
Work Step by Step
$P(x)=-(x-4)^2(x-3i)(x+3i)=-(x^2-8x+16)(x^2+9)
=-(x^4-8x^3+9x^2+16x^2-72x+144)=-x^4+8x^3-25x^2+72x-144$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 3 - Review - Exercises - Page 321: 54
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