Question
Answer
$$7\sqrt{6}\cdot7\sqrt{14}=98\sqrt{21}$$
Explanation
| $$ \begin{aligned}7\sqrt{6}\cdot7\sqrt{14}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}98\sqrt{21}\end{aligned} $$ | |
| ① | $$ 49 \sqrt{84} =
49 \sqrt{ 2 ^2 \cdot 21 } =
49 \sqrt{ 2 ^2 } \, \sqrt{ 21 } =
49 \cdot 2 \sqrt{ 21 } =
98 \sqrt{ 21 } $$ |
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