Question
Answer
$$\dfrac{\sqrt{480}}{14}=\dfrac{2\sqrt{30}}{7}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{\sqrt{480}}{14}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{ \sqrt{ 16 \cdot 30 } }{ 14 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{ \sqrt{ 16 } \cdot \sqrt{ 30 } }{ 14 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{4\sqrt{30}}{14} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}} \frac{ 4 \cdot \sqrt{ 30 } : \color{orangered}{ 2 }}{ 14 : \color{orangered}{ 2 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{2\sqrt{30}}{7}\end{aligned} $$ | |
| ① | Factor out the largest perfect square of 480. ( in this example we factored out $ 16 $ ) |
| ② | Rewrite $ \sqrt{ 16 \cdot 30 } $ as the product of two radicals. |
| ③ | The square root of $ 16 $ is $ 4 $. |
| ④ | Divide numerator and denominator by $ \color{orangered}{ 2 } $. |
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