Question
Answer
$$7\sqrt{5}\cdot3\sqrt{28}=42\sqrt{35}$$
Explanation
| $$ \begin{aligned}7\sqrt{5}\cdot3\sqrt{28}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}42\sqrt{35}\end{aligned} $$ | |
| ① | $$ 21 \sqrt{140} =
21 \sqrt{ 2 ^2 \cdot 35 } =
21 \sqrt{ 2 ^2 } \, \sqrt{ 35 } =
21 \cdot 2 \sqrt{ 35 } =
42 \sqrt{ 35 } $$ |
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