Answer
$7x^2-3x+8$
Work Step by Step
By combining like terms, the given expression, $
x^2-2x-4+6x^2-x+12
,$ simplifies to
\begin{array}{l}\require{cancel}
(x^2+6x^2)+(-2x-x)+(-4+12)
\\\\=
7x^2-3x+8
.\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 2 - Real Numbers - 2.4 - Exponents - Problem Set 2.4 - Page 75: 63
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