Answer
$10x^5 + 3x^3 - 10x^2 + 6$
Work Step by Step
We simplify by removing the parentheses and then combine the like terms as follows
$$
(10x^5 - 8x^2) + (3x^3 - 2x^2 + 6)=10x^5 - 8x^2 + 3x^3 - 2x^2 + 6\\
=10x^5 + 3x^3 - 10x^2 + 6
.$$
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