Answer
$$\frac{\sqrt{11}+\sqrt{8}}{\sqrt{11}-\sqrt{2}}=\frac{5+\sqrt{22}}{3}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{\sqrt{11}+\sqrt{8}}{\sqrt{11}-\sqrt{2}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{\sqrt{11}+\sqrt{8}}{\sqrt{11}-\sqrt{2}}\frac{\sqrt{11}+\sqrt{2}}{\sqrt{11}+\sqrt{2}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{11+\sqrt{22}+2\sqrt{22}+4}{11+\sqrt{22}-\sqrt{22}-2} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{15+3\sqrt{22}}{9} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}\frac{5+\sqrt{22}}{3}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{11} + \sqrt{2}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( \sqrt{11} + \sqrt{8}\right) } \cdot \left( \sqrt{11} + \sqrt{2}\right) = \color{blue}{ \sqrt{11}} \cdot \sqrt{11}+\color{blue}{ \sqrt{11}} \cdot \sqrt{2}+\color{blue}{ \sqrt{8}} \cdot \sqrt{11}+\color{blue}{ \sqrt{8}} \cdot \sqrt{2} = \\ = 11 + \sqrt{22} + 2 \sqrt{22} + 4 $$ Simplify denominator. $$ \color{blue}{ \left( \sqrt{11}- \sqrt{2}\right) } \cdot \left( \sqrt{11} + \sqrt{2}\right) = \color{blue}{ \sqrt{11}} \cdot \sqrt{11}+\color{blue}{ \sqrt{11}} \cdot \sqrt{2}\color{blue}{- \sqrt{2}} \cdot \sqrt{11}\color{blue}{- \sqrt{2}} \cdot \sqrt{2} = \\ = 11 + \sqrt{22}- \sqrt{22}-2 $$ |
| ③ | Simplify numerator and denominator |
| ④ | Divide both numerator and denominator by 3. |
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