Answer
$$-(5x-6)(5x+6)=-25x^2+36$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-(5x-6)(5x+6)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(25x^2+30x-30x-36) \xlongequal{ } \\[1 em] & \xlongequal{ }-(25x^2-36) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-25x^2+36\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{5x-6}\right) $ by each term in $ \left( 5x+6\right) $. $$ \left( \color{blue}{5x-6}\right) \cdot \left( 5x+6\right) = 25x^2+ \cancel{30x} -\cancel{30x}-36 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(25x^2-36 \right) = -25x^2+36 $$ |
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