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If $$x + \left( {\frac{1}{x}} \right) = 2{\text{,}}$$ then the value of $${x^7}{\text{ + }}\left( {\frac{1}{{{x^5}}}} \right)$$ is?
Answer & Solution
Correct Answer:
Option
C
$$\eqalign{
& x + \frac{1}{x} = 2 \cr
& {\text{Find , }}{x^7} + \frac{1}{{{x^5}}} \cr
& \,\,\,\,\,\,\,x + \frac{1}{x} = 2 \cr
& \Rightarrow \mathop \downarrow \limits_1 {\text{ }}\,\,\,\,{\text{ }}\mathop \downarrow \limits_1 \,\,\,\,\,\,\,\,\,\,\,\,\,\, \Rightarrow {\text{Let }}x = 1 \cr
& {\text{To put value in question,}} \cr
& \Rightarrow {x^7} + \frac{1}{{{x^5}}} \cr
& \Rightarrow {{\text{1}}^7} + \frac{1}{{{1^5}}} \cr
& \Rightarrow 1 + 1 \cr
& \Rightarrow 2 \cr} $$
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