Question
Answer
$$\dfrac{240\sqrt{18}}{18\sqrt{8}}=20$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{240\sqrt{18}}{18\sqrt{8}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{240\sqrt{18}}{18\sqrt{8}}\frac{\sqrt{8}}{\sqrt{8}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{2880}{144} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}} \frac{ 2880 : \color{orangered}{ 144 } }{ 144 : \color{orangered}{ 144 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{20}{1} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}20\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{8}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ 240 \sqrt{18} } \cdot \sqrt{8} = 2880 $$ Simplify denominator. $$ \color{blue}{ 18 \sqrt{8} } \cdot \sqrt{8} = 144 $$ |
| ③ | Divide both the top and bottom numbers by $ \color{orangered}{ 144 } $. |
| ④ | Remove 1 from denominator. |
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