Tap the blue circles to see an explanation.
$$ \begin{aligned}-3(x+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(3x+3) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-3x-3\end{aligned} $$ | |
① | Multiply $ \color{blue}{3} $ by $ \left( x+1\right) $ $$ \color{blue}{3} \cdot \left( x+1\right) = 3x+3 $$ |
② | Remove the parentheses by changing the sign of each term within them. $$ - \left(3x+3 \right) = -3x-3 $$ |