Answer
$2t^3+t^2+5t+9$
Work Step by Step
By combining like terms, the given expression, $
(7+4t-5t^2+6t^3)+(2+t+6t^2-4t^3)
$, simplifies to
\begin{array}{l}
(6t^3-4t^3)+(-5t^2+6t^2)+(4t+t)+(7+2)
\\\\=
2t^3+t^2+5t+9
.\end{array}
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 4 - Polynomials - 4.4 Addition and Subtraction of Polynomials - 4.4 Exercise Set - Page 259: 20
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