Question
Answer
$$\sqrt{75}-21=5\sqrt{3}-21$$
Explanation
| $$ \begin{aligned}\sqrt{75}-21& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5\sqrt{3}-21\end{aligned} $$ | |
| ① | $$ \sqrt{75} =
\sqrt{ 5 ^2 \cdot 3 } =
\sqrt{ 5 ^2 } \, \sqrt{ 3 } =
5 \sqrt{ 3 }$$ |
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