A) 6
B) 9
C) 3
D) 4
Correct Answer: C
Solution :
(c) \[{{x}^{2}}+\frac{1}{{{x}^{2}}}=7\] \[\Rightarrow {{x}^{2}}+\frac{1}{{{x}^{2}}}+2=9\] \[\Rightarrow {{\left( x+\frac{1}{x} \right)}^{2}}=9\] \[\Rightarrow x+\frac{1}{x}=3.\]You need to login to perform this action.
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