Answer
$$2(-9x)^2+2(-9x)=162x^2-18x$$
Explanation
| $$ \begin{aligned}2(-9x)^2+2(-9x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2\cdot81x^2+2(-9x) \xlongequal{ } \\[1 em] & \xlongequal{ }162x^2-18x\end{aligned} $$ | |
| ① | $$ \left( -9x \right)^2 = (-9)^2x^2 = 81x^2 $$ |
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