Answer
$$3(-5x)^3+4(-5x)-4=-375x^3-20x-4$$
Explanation
| $$ \begin{aligned}3(-5x)^3+4(-5x)-4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3\cdot-125x^3+4(-5x)-4 \xlongequal{ } \\[1 em] & \xlongequal{ }-375x^3-20x-4\end{aligned} $$ | |
| ① | $$ \left( -5x \right)^3 = (-5)^3x^3 = -125x^3 $$ |
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