1.

If $$x - \frac{1}{x} = 4{\text{,}}$$then $$\left( {x + \frac{1}{x}} \right)$$is equal to?

A. ${\text{5}}\sqrt 2 $$
B. ${\text{2}}\sqrt 5 $$
C. ${\text{4}}\sqrt 2 $$
D. ${\text{4}}\sqrt 5 $$
Answer» C. ${\text{4}}\sqrt 2 $$


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