A) \[-27\]
B) \[23\]
C) \[-9\]
D) \[16\]
Correct Answer: C
Solution :
\[x-\frac{1}{x}=5\] \[\Rightarrow \] \[{{\left( x-\frac{1}{x} \right)}^{2}}={{5}^{2}}\] \[\Rightarrow \] \[{{x}^{2}}+\frac{1}{{{x}^{2}}}-2=25\] \[\Rightarrow \] \[{{x}^{2}}+\frac{1}{{{x}^{2}}}=27\]You need to login to perform this action.
You will be redirected in
3 sec