Question
Answer
$$-6\sqrt{81}+6\sqrt{81}=0$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-6\sqrt{81}+6\sqrt{81}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-54+54 \xlongequal{ } \\[1 em] & \xlongequal{ }0\end{aligned} $$ | |
| ① | $$ - 6 \sqrt{81} = -6 \cdot 9 = -54 $$ |
| ② | $$ 6 \sqrt{81} = 6 \cdot 9 = 54 $$ |
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