Question
Answer
$$\dfrac{\sqrt{28}}{10}=\dfrac{\sqrt{7}}{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{\sqrt{28}}{10}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{ \sqrt{ 4 \cdot 7 } }{ 10 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{ \sqrt{ 4 } \cdot \sqrt{ 7 } }{ 10 } \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{2\sqrt{7}}{10} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}} \frac{ 2 \cdot \sqrt{ 7 } : \color{orangered}{ 2 }}{ 10 : \color{orangered}{ 2 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{\sqrt{7}}{5}\end{aligned} $$ | |
| ① | Factor out the largest perfect square of 28. ( in this example we factored out $ 4 $ ) |
| ② | Rewrite $ \sqrt{ 4 \cdot 7 } $ as the product of two radicals. |
| ③ | The square root of $ 4 $ is $ 2 $. |
| ④ | Divide numerator and denominator by $ \color{orangered}{ 2 } $. |
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Simplify Radical Expression