Answer
$b=-3$
Work Step by Step
The equation is the same as: $5b^3+15b^2+12b+36=(b+3)(5b^2+12)=0$
Thus $5b^2+12=0$ (but this is impossible since $b^2$ is non-negative) or $b+3=0\\b=-3$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 5 Polynomials and Polynomial Functions - 5.4 Factor and Solve Polynomial Equations - 5.4 Exercises - Skill Practice - Page 357: 38
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