Question
Answer
$$10\cdot2\sqrt{1424}=80\sqrt{89}$$
Explanation
| $$ \begin{aligned}10\cdot2\sqrt{1424}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}80\sqrt{89}\end{aligned} $$ | |
| ① | $$ 20 \sqrt{1424} =
20 \sqrt{ 4 ^2 \cdot 89 } =
20 \sqrt{ 4 ^2 } \, \sqrt{ 89 } =
20 \cdot 4 \sqrt{ 89 } =
80 \sqrt{ 89 } $$ |
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