Answer
$x^3-4x^2 +9x+7$
Work Step by Step
We simplify by removing the parentheses and then combine the like terms as follows
$$
(x^3 - 2x^2 + 5x + 10) - (2x^2 - 4x + 3)=x^3 - 2x^2 + 5x + 10 - 2x^2 + 4x - 3\\
=x^3-4x^2 +9x+7
.$$
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