Question
Answer
$$-5k^2(k^2-4k)=-5k^4+20k^3$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-5k^2(k^2-4k)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(5k^4-20k^3) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-5k^4+20k^3\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5k^2} $ by $ \left( k^2-4k\right) $ $$ \color{blue}{5k^2} \cdot \left( k^2-4k\right) = 5k^4-20k^3 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(5k^4-20k^3 \right) = -5k^4+20k^3 $$ |
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