question_answer

The roots of the equation \[{{x}^{-2}}+{{x}^{-1}}=12\] are

A)  \[\frac{1}{2},\frac{1}{3}\]                           

B)   \[\frac{1}{3},-\frac{1}{4}\]  

C)  3, - 3                    

D)         None of these