Answer
$$\frac{5}{\sqrt{6}+\sqrt{3}}=\frac{5\sqrt{6}-5\sqrt{3}}{3}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{5}{\sqrt{6}+\sqrt{3}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{5}{\sqrt{6}+\sqrt{3}}\frac{\sqrt{6}-\sqrt{3}}{\sqrt{6}-\sqrt{3}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{5\sqrt{6}-5\sqrt{3}}{6-3\sqrt{2}+3\sqrt{2}-3} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{5\sqrt{6}-5\sqrt{3}}{3}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{6}- \sqrt{3}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ 5 } \cdot \left( \sqrt{6}- \sqrt{3}\right) = \color{blue}{5} \cdot \sqrt{6}+\color{blue}{5} \cdot- \sqrt{3} = \\ = 5 \sqrt{6}- 5 \sqrt{3} $$ Simplify denominator. $$ \color{blue}{ \left( \sqrt{6} + \sqrt{3}\right) } \cdot \left( \sqrt{6}- \sqrt{3}\right) = \color{blue}{ \sqrt{6}} \cdot \sqrt{6}+\color{blue}{ \sqrt{6}} \cdot- \sqrt{3}+\color{blue}{ \sqrt{3}} \cdot \sqrt{6}+\color{blue}{ \sqrt{3}} \cdot- \sqrt{3} = \\ = 6- 3 \sqrt{2} + 3 \sqrt{2}-3 $$ |
| ③ | Simplify numerator and denominator |
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