Answer
$-3t^{2}+21t-22$
Work Step by Step
Expand the brackets, be mindful of the negative sign:
$=15t-20-t^{2}-2-2t^{2}+6t$
Collect the like terms:
$=(-1-2)t^{2}+(15+6)t+(-20-2)$
$=-3t^{2}+21t-22$
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 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 33: 24
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