Question
Answer
$$-9x(-9x+7)=81x^2-63x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-9x(-9x+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(-81x^2+63x) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}81x^2-63x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{9x} $ by $ \left( -9x+7\right) $ $$ \color{blue}{9x} \cdot \left( -9x+7\right) = -81x^2+63x $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(-81x^2+63x \right) = 81x^2-63x $$ |
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