Answer
$$(-2-1)\cdot(4+1)=-15$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-2-1)\cdot(4+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-3\cdot5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-15\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-2} \color{blue}{-1} = \color{blue}{-3} $$Combine like terms: $$ \color{blue}{4} + \color{blue}{1} = \color{blue}{5} $$ |
| ② | $ -3 \cdot 5 = -15 $ |
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