Answer
See below
Work Step by Step
Given: $E(t)=-10t^3+140t^2-20t+18150$
Since $E(t)=20300$,
we obtain: $-10t^3+140t^2-20t+18150=20300$
Subtract $20300$ from both sides:
$-10t^3+140t^2-20t-2150=0\\ \rightarrow t^3-14t^2+2t+215=0$
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 - 5.6 Find Rational Zeroes - 5.6 Exercises - Problem Solving - Page 376: 49a
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