Question
Answer
$$2\sqrt{20}(-4\sqrt{35})=-80\sqrt{7}$$
Explanation
| $$ \begin{aligned}2\sqrt{20}(-4\sqrt{35})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-80\sqrt{7}\end{aligned} $$ | |
| ① | $$ - 8 \sqrt{700} =
-8 \sqrt{ 10 ^2 \cdot 7 } =
-8 \sqrt{ 10 ^2 } \, \sqrt{ 7 } =
-8 \cdot 10 \sqrt{ 7 } =
-80 \sqrt{ 7 } $$ |
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