Question
Answer
$$\dfrac{7\sqrt{10}}{14\sqrt{10}}=\dfrac{1}{2}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{7\sqrt{10}}{14\sqrt{10}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{7\sqrt{10}}{14\sqrt{10}}\frac{\sqrt{10}}{\sqrt{10}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{70}{140} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}} \frac{ 70 : \color{orangered}{ 70 } }{ 140 : \color{orangered}{ 70 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{1}{2}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{10}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ 7 \sqrt{10} } \cdot \sqrt{10} = 70 $$ Simplify denominator. $$ \color{blue}{ 14 \sqrt{10} } \cdot \sqrt{10} = 140 $$ |
| ③ | Divide both the top and bottom numbers by $ \color{orangered}{ 70 } $. |
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