Question
Find the following product:
$9 x^2(5 x+7)$
$9 x^2(5 x+7)$
✓
Answer
$-9 x^2 \times 5 x+9 x^2 \times 7$
$-9 \times 5 \times x^2 \times x+9 \times 7 \times x^2$
$=45 x^{(2+1)}+63 x^2$
$=45 x^3+63 x^2$
$-9 \times 5 \times x^2 \times x+9 \times 7 \times x^2$
$=45 x^{(2+1)}+63 x^2$
$=45 x^3+63 x^2$
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