Answer
$$-8\sqrt{28}-7=-16\sqrt{7}-7$$
Explanation
| $$ \begin{aligned}-8\sqrt{28}-7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-16\sqrt{7}-7\end{aligned} $$ | |
| ① | $$ - 8 \sqrt{28} =
-8 \sqrt{ 2 ^2 \cdot 7 } =
-8 \sqrt{ 2 ^2 } \, \sqrt{ 7 } =
-8 \cdot 2 \sqrt{ 7 } =
-16 \sqrt{ 7 } $$ |
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