Question
Answer
$$\dfrac{15-\sqrt{27}}{\sqrt{3}}=5\sqrt{3}-3$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{15-\sqrt{27}}{\sqrt{3}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{15-\sqrt{27}}{\sqrt{3}}\frac{\sqrt{3}}{\sqrt{3}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{15\sqrt{3}-9}{3} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}\frac{5\sqrt{3}-3}{1} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}5\sqrt{3}-3\end{aligned} $$ | |
| ① | Multiply the numerator and denominator by the conjugate of the denominator . $$\color{blue}{ \sqrt{3}} $$. |
| ② | Multiply in a numerator. $$ \color{blue}{ \left( 15- \sqrt{27}\right) } \cdot \sqrt{3} = \color{blue}{15} \cdot \sqrt{3}\color{blue}{- \sqrt{27}} \cdot \sqrt{3} = \\ = 15 \sqrt{3}-9 $$ Simplify denominator. $$ \color{blue}{ \sqrt{3} } \cdot \sqrt{3} = 3 $$ |
| ③ | Divide both numerator and denominator by 3. |
| ④ | Remove 1 from denominator. |
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