Question
Answer
$$\dfrac{4\sqrt{24}-2}{\sqrt{6}+1}=\dfrac{50-10\sqrt{6}}{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{4\sqrt{24}-2}{\sqrt{6}+1}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{4\sqrt{24}-2}{\sqrt{6}+1}\frac{\sqrt{6}-1}{\sqrt{6}-1} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{48-8\sqrt{6}-2\sqrt{6}+2}{6-\sqrt{6}+\sqrt{6}-1} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{50-10\sqrt{6}}{5}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{6}-1} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( 4 \sqrt{24}-2\right) } \cdot \left( \sqrt{6}-1\right) = \color{blue}{ 4 \sqrt{24}} \cdot \sqrt{6}+\color{blue}{ 4 \sqrt{24}} \cdot-1\color{blue}{-2} \cdot \sqrt{6}\color{blue}{-2} \cdot-1 = \\ = 48- 8 \sqrt{6}- 2 \sqrt{6} + 2 $$ Simplify denominator. $$ \color{blue}{ \left( \sqrt{6} + 1\right) } \cdot \left( \sqrt{6}-1\right) = \color{blue}{ \sqrt{6}} \cdot \sqrt{6}+\color{blue}{ \sqrt{6}} \cdot-1+\color{blue}{1} \cdot \sqrt{6}+\color{blue}{1} \cdot-1 = \\ = 6- \sqrt{6} + \sqrt{6}-1 $$ |
| ③ | Simplify numerator and denominator |
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