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If x = 5 + 2√6, then what is the value of $$\sqrt x + \frac{1}{{\sqrt x }}?$$
Answer & Solution
Correct Answer:
Option
A
$$\eqalign{
& x = 5 + 2\sqrt 6 \cr
& \Rightarrow x = {\left( {\sqrt 3 + \sqrt 2 } \right)^2} \cr
& \Rightarrow \sqrt x = \sqrt 3 + \sqrt 2 \cr
& \Rightarrow \frac{1}{{\sqrt x }} = \sqrt 3 - \sqrt 2 \cr
& \Rightarrow \sqrt x + \frac{1}{{\sqrt x }} = \sqrt 3 + \sqrt 2 + \sqrt 3 - \sqrt 2 \cr
& \Rightarrow \sqrt x + \frac{1}{{\sqrt x }} = 2\sqrt 3 \cr} $$
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