Question
Multiply $: 4xy$ and $− x^2y − 3x^2y^2$
✓
Answer
$− x^2y − 3x^2y^2 \times 4xy$
$= − x^2y \times 4xy − 3x^2y^2 \times 4xy$
$= − 4x^3y^2 − 12x^3y^3$
$= − x^2y \times 4xy − 3x^2y^2 \times 4xy$
$= − 4x^3y^2 − 12x^3y^3$
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