Answer
$$3\sqrt{9}+3\sqrt{16}=21$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3\sqrt{9}+3\sqrt{16}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9+12 \xlongequal{ } \\[1 em] & \xlongequal{ }21\end{aligned} $$ | |
| ① | $$ 3 \sqrt{9} = 3 \cdot 3 = 9 $$ |
| ② | $$ 3 \sqrt{16} = 3 \cdot 4 = 12 $$ |
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