Answer
$$9\sqrt{125}=45\sqrt{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}9\sqrt{125}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9\cdot \sqrt{ 25 \cdot 5 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9\cdot \sqrt{ 25 } \cdot \sqrt{ 5 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}9\cdot5 \sqrt{ 5 } \xlongequal{ } \\[1 em] & \xlongequal{ }45\sqrt{5}\end{aligned} $$ | |
| ① | Factor out the largest perfect square of 125. ( in this example we factored out $ 25 $ ) |
| ② | Rewrite $ \sqrt{ 25 \cdot 5 } $ as the product of two radicals. |
| ③ | The square root of $ 25 $ is $ 5 $. |
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