Question
Simplify, giving Solution with positive index
$(- 4x) (-5x^2)$
$(- 4x) (-5x^2)$
✓
Answer
$\begin{aligned} & (-4 x)\left(-5 x^2\right) \\ & =(-1 \times 4 \times x) \cdot\left(-1 \times 5 \times x^2\right)^1 \\ & =-1 \times 4 \times x \cdot-1 \times 5 \times x^2 \\ & =-1 \times-1 \times 4 \times 5 \times x^{1+2} \\ & =-1^{1+1} \cdot 4^1 \cdot 5^1 x^3=20 x^3\end{aligned}$
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