Question
Answer
$$5k+5-(-k-4)=6k+9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5k+5-(-k-4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5k+5+k+4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}6k+9\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -k-4 \right) = k+4 $$ |
| ② | Combine like terms: $$ \color{blue}{5k} + \color{red}{5} + \color{blue}{k} + \color{red}{4} = \color{blue}{6k} + \color{red}{9} $$ |
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