Question
Answer
$$12\sqrt{9}-7\sqrt{9}=15$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}12\sqrt{9}-7\sqrt{9}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}36-21 \xlongequal{ } \\[1 em] & \xlongequal{ }15\end{aligned} $$ | |
| ① | $$ 12 \sqrt{9} = 12 \cdot 3 = 36 $$ |
| ② | $$ - 7 \sqrt{9} = -7 \cdot 3 = -21 $$ |
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