Answer
$$\frac{30}{2\sqrt{3}-3\sqrt{2}}=-\frac{60\sqrt{3}+90\sqrt{2}}{6}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{30}{2\sqrt{3}-3\sqrt{2}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{30}{2\sqrt{3}-3\sqrt{2}}\frac{2\sqrt{3}+3\sqrt{2}}{2\sqrt{3}+3\sqrt{2}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{60\sqrt{3}+90\sqrt{2}}{12+6\sqrt{6}-6\sqrt{6}-18} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{60\sqrt{3}+90\sqrt{2}}{-6} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}-\frac{60\sqrt{3}+90\sqrt{2}}{6}\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ 2 \sqrt{3} + 3 \sqrt{2}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ 30 } \cdot \left( 2 \sqrt{3} + 3 \sqrt{2}\right) = \color{blue}{30} \cdot 2 \sqrt{3}+\color{blue}{30} \cdot 3 \sqrt{2} = \\ = 60 \sqrt{3} + 90 \sqrt{2} $$ Simplify denominator. $$ \color{blue}{ \left( 2 \sqrt{3}- 3 \sqrt{2}\right) } \cdot \left( 2 \sqrt{3} + 3 \sqrt{2}\right) = \color{blue}{ 2 \sqrt{3}} \cdot 2 \sqrt{3}+\color{blue}{ 2 \sqrt{3}} \cdot 3 \sqrt{2}\color{blue}{- 3 \sqrt{2}} \cdot 2 \sqrt{3}\color{blue}{- 3 \sqrt{2}} \cdot 3 \sqrt{2} = \\ = 12 + 6 \sqrt{6}- 6 \sqrt{6}-18 $$ |
| ③ | Simplify numerator and denominator |
| ④ | Place a negative sign in front of a fraction. |
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