Answer
$$3(-5x)^2+4(-5x)-4=75x^2-20x-4$$
Explanation
| $$ \begin{aligned}3(-5x)^2+4(-5x)-4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3\cdot25x^2+4(-5x)-4 \xlongequal{ } \\[1 em] & \xlongequal{ }75x^2-20x-4\end{aligned} $$ | |
| ① | $$ \left( -5x \right)^2 = (-5)^2x^2 = 25x^2 $$ |
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