Question
Answer
$$8r^2+5r+6-(2r+4)=8r^2+3r+2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8r^2+5r+6-(2r+4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8r^2+5r+6-2r-4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8r^2+3r+2\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 2r+4 \right) = -2r-4 $$ |
| ② | Combine like terms: $$ 8r^2+ \color{blue}{5r} + \color{red}{6} \color{blue}{-2r} \color{red}{-4} = 8r^2+ \color{blue}{3r} + \color{red}{2} $$ |
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