Answer
$-3a^{2} - 2b^{2}$
Work Step by Step
We first rewrite the order of the expression and then combine like terms to obtain:
$-2a^{2} + 3b^{2} - 5b^{2} - a^{2}$
$-2a^{2} - a^{2}+ 3b^{2} - 5b^{2}$
$-3a^{2} - 2b^{2}$
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