Answer
$$-3\sqrt{81}+\sqrt{16}=-23$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-3\sqrt{81}+\sqrt{16}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-27+4 \xlongequal{ } \\[1 em] & \xlongequal{ }-23\end{aligned} $$ | |
| ① | $$ - 3 \sqrt{81} = -3 \cdot 9 = -27 $$ |
| ② | $$ \sqrt{16} = 4 $$ |
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