Question
Answer
$$-4x(-2x+10)=8x^2-40x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-4x(-2x+10)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(-8x^2+40x) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8x^2-40x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4x} $ by $ \left( -2x+10\right) $ $$ \color{blue}{4x} \cdot \left( -2x+10\right) = -8x^2+40x $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(-8x^2+40x \right) = 8x^2-40x $$ |
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