Question
Answer
$$3^2-(6a+21)=-6a-12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3^2-(6a+21)& \xlongequal{ }9-(6a+21) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9-6a-21 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-6a-12\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 6a+21 \right) = -6a-21 $$ |
| ② | Combine like terms: $$ \color{blue}{9} -6a \color{blue}{-21} = -6a \color{blue}{-12} $$ |
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