Answer
$4x^2+5x-13$
Work Step by Step
The given expression, $
(3x^2-x-3)-(-x^2-6x+10)
,$ simplifies to
\begin{array}{l}\require{cancel}
3x^2-x-3+x^2+6x-10
\\\\=
(3x^2+x^2)+(-x+6x)+(-3-10)
\\\\=
4x^2+5x-13
.\end{array}
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