Answer
$-x^4-x^3$
Work Step by Step
By combining like terms, the given expression, $
10x^2+2x^3-3x^3-4x^2-6x^2-x^4
$, simplifies to
\begin{array}{l}
-x^4+(-3x^3+2x^3)+(10x^2-4x^2-6x^2)
\\\\=
-x^4-x^3+0x^2
\\\\=
-x^4-x^3
.\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 - 4.3 Polynomials - 4.3 Exercise Set - Page 252: 47
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