Answer
$$4b-(9b-8)=-5b+8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4b-(9b-8)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4b-9b+8 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-5b+8\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 9b-8 \right) = -9b+8 $$ |
| ② | Combine like terms: $$ \color{blue}{4b} \color{blue}{-9b} +8 = \color{blue}{-5b} +8 $$ |
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