A) 50
B) 51
C) 49
D) 47
Correct Answer: B
Solution :
\[{{\left( a-\frac{1}{a} \right)}^{2}}={{a}^{2}}-2+\frac{1}{{{a}^{2}}}=49\] \[\Rightarrow {{a}^{2}}+\frac{1}{{{a}^{2}}}=49+2=51\]You need to login to perform this action.
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