Question
Answer
$$\dfrac{4-\sqrt{10}}{8+\sqrt{6}}=\dfrac{16-2\sqrt{6}-4\sqrt{10}+\sqrt{15}}{29}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{4-\sqrt{10}}{8+\sqrt{6}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{4-\sqrt{10}}{8+\sqrt{6}}\frac{8-\sqrt{6}}{8-\sqrt{6}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{32-4\sqrt{6}-8\sqrt{10}+2\sqrt{15}}{64-8\sqrt{6}+8\sqrt{6}-6} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{32-4\sqrt{6}-8\sqrt{10}+2\sqrt{15}}{58} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}\frac{16-2\sqrt{6}-4\sqrt{10}+\sqrt{15}}{29}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ 8- \sqrt{6}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( 4- \sqrt{10}\right) } \cdot \left( 8- \sqrt{6}\right) = \color{blue}{4} \cdot8+\color{blue}{4} \cdot- \sqrt{6}\color{blue}{- \sqrt{10}} \cdot8\color{blue}{- \sqrt{10}} \cdot- \sqrt{6} = \\ = 32- 4 \sqrt{6}- 8 \sqrt{10} + 2 \sqrt{15} $$ Simplify denominator. $$ \color{blue}{ \left( 8 + \sqrt{6}\right) } \cdot \left( 8- \sqrt{6}\right) = \color{blue}{8} \cdot8+\color{blue}{8} \cdot- \sqrt{6}+\color{blue}{ \sqrt{6}} \cdot8+\color{blue}{ \sqrt{6}} \cdot- \sqrt{6} = \\ = 64- 8 \sqrt{6} + 8 \sqrt{6}-6 $$ |
| ③ | Simplify numerator and denominator |
| ④ | Divide both numerator and denominator by 2. |
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