Answer
$$-5x^2(6x-1)=-30x^3+5x^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-5x^2(6x-1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(30x^3-5x^2) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-30x^3+5x^2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5x^2} $ by $ \left( 6x-1\right) $ $$ \color{blue}{5x^2} \cdot \left( 6x-1\right) = 30x^3-5x^2 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(30x^3-5x^2 \right) = -30x^3+5x^2 $$ |
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