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