Answer
$$\frac{7}{18-\sqrt{3}}=\frac{126+7\sqrt{3}}{321}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{7}{18-\sqrt{3}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{7}{18-\sqrt{3}}\frac{18+\sqrt{3}}{18+\sqrt{3}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{126+7\sqrt{3}}{324+18\sqrt{3}-18\sqrt{3}-3} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{126+7\sqrt{3}}{321}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ 18 + \sqrt{3}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ 7 } \cdot \left( 18 + \sqrt{3}\right) = \color{blue}{7} \cdot18+\color{blue}{7} \cdot \sqrt{3} = \\ = 126 + 7 \sqrt{3} $$ Simplify denominator. $$ \color{blue}{ \left( 18- \sqrt{3}\right) } \cdot \left( 18 + \sqrt{3}\right) = \color{blue}{18} \cdot18+\color{blue}{18} \cdot \sqrt{3}\color{blue}{- \sqrt{3}} \cdot18\color{blue}{- \sqrt{3}} \cdot \sqrt{3} = \\ = 324 + 18 \sqrt{3}- 18 \sqrt{3}-3 $$ |
| ③ | Simplify numerator and denominator |
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