Question
Answer
$$\dfrac{2\sqrt{3}-\sqrt{5}}{2\sqrt{2}+2\sqrt{3}}=\dfrac{-2\sqrt{6}+6+\sqrt{10}-\sqrt{15}}{2}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{2\sqrt{3}-\sqrt{5}}{2\sqrt{2}+2\sqrt{3}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{2\sqrt{3}-\sqrt{5}}{2\sqrt{2}+2\sqrt{3}}\frac{2\sqrt{2}-2\sqrt{3}}{2\sqrt{2}-2\sqrt{3}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{4\sqrt{6}-12-2\sqrt{10}+2\sqrt{15}}{8-4\sqrt{6}+4\sqrt{6}-12} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{4\sqrt{6}-12-2\sqrt{10}+2\sqrt{15}}{-4} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}\frac{2\sqrt{6}-6-\sqrt{10}+\sqrt{15}}{-2} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle5}{\textcircled {5}} } }}}\frac{-2\sqrt{6}+6+\sqrt{10}-\sqrt{15}}{2}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ 2 \sqrt{2}- 2 \sqrt{3}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( 2 \sqrt{3}- \sqrt{5}\right) } \cdot \left( 2 \sqrt{2}- 2 \sqrt{3}\right) = \color{blue}{ 2 \sqrt{3}} \cdot 2 \sqrt{2}+\color{blue}{ 2 \sqrt{3}} \cdot- 2 \sqrt{3}\color{blue}{- \sqrt{5}} \cdot 2 \sqrt{2}\color{blue}{- \sqrt{5}} \cdot- 2 \sqrt{3} = \\ = 4 \sqrt{6}-12- 2 \sqrt{10} + 2 \sqrt{15} $$ Simplify denominator. $$ \color{blue}{ \left( 2 \sqrt{2} + 2 \sqrt{3}\right) } \cdot \left( 2 \sqrt{2}- 2 \sqrt{3}\right) = \color{blue}{ 2 \sqrt{2}} \cdot 2 \sqrt{2}+\color{blue}{ 2 \sqrt{2}} \cdot- 2 \sqrt{3}+\color{blue}{ 2 \sqrt{3}} \cdot 2 \sqrt{2}+\color{blue}{ 2 \sqrt{3}} \cdot- 2 \sqrt{3} = \\ = 8- 4 \sqrt{6} + 4 \sqrt{6}-12 $$ |
| ③ | Simplify numerator and denominator |
| ④ | Divide both numerator and denominator by 2. |
| ⑤ | Multiply both numerator and denominator by -1. |
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