Answer
$$\frac{4\sqrt{5}+5\sqrt{2}}{\sqrt{48}+\sqrt{18}}=\frac{8\sqrt{15}-6\sqrt{10}+10\sqrt{6}-15}{15}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{4\sqrt{5}+5\sqrt{2}}{\sqrt{48}+\sqrt{18}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{4\sqrt{5}+5\sqrt{2}}{\sqrt{48}+\sqrt{18}}\frac{\sqrt{48}-\sqrt{18}}{\sqrt{48}-\sqrt{18}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{16\sqrt{15}-12\sqrt{10}+20\sqrt{6}-30}{48-12\sqrt{6}+12\sqrt{6}-18} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{16\sqrt{15}-12\sqrt{10}+20\sqrt{6}-30}{30} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}\frac{8\sqrt{15}-6\sqrt{10}+10\sqrt{6}-15}{15}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{48}- \sqrt{18}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( 4 \sqrt{5} + 5 \sqrt{2}\right) } \cdot \left( \sqrt{48}- \sqrt{18}\right) = \color{blue}{ 4 \sqrt{5}} \cdot \sqrt{48}+\color{blue}{ 4 \sqrt{5}} \cdot- \sqrt{18}+\color{blue}{ 5 \sqrt{2}} \cdot \sqrt{48}+\color{blue}{ 5 \sqrt{2}} \cdot- \sqrt{18} = \\ = 16 \sqrt{15}- 12 \sqrt{10} + 20 \sqrt{6}-30 $$ Simplify denominator. $$ \color{blue}{ \left( \sqrt{48} + \sqrt{18}\right) } \cdot \left( \sqrt{48}- \sqrt{18}\right) = \color{blue}{ \sqrt{48}} \cdot \sqrt{48}+\color{blue}{ \sqrt{48}} \cdot- \sqrt{18}+\color{blue}{ \sqrt{18}} \cdot \sqrt{48}+\color{blue}{ \sqrt{18}} \cdot- \sqrt{18} = \\ = 48- 12 \sqrt{6} + 12 \sqrt{6}-18 $$ |
| ③ | Simplify numerator and denominator |
| ④ | Divide both numerator and denominator by 2. |
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