Question
Multiply : $\left(7 a^3-5 a b^2-2 b^3+3 a b+2 a-5\right) by -3 a b^2$
✓
Answer
$-21 a^4 b^2+15 a^2 b^4+6 a b^5-9 a^2 b^3-6 a^2 b^2+15 a b^2$
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