A) 120
B) 140
C) 100
D) 110
Correct Answer: B
Solution :
(b): questions 14 to 16 are problems of similar type. They are based on the formula \[{{\left( a+\frac{1}{a} \right)}^{2}}={{a}^{2}}+2.a.\frac{1}{a}+\frac{1}{{{a}^{2}}}={{a}^{2}}+2+\frac{1}{{{a}^{2}}}\] or, \[{{\left( a-\frac{1}{a} \right)}^{2}}={{a}^{2}}-2+\frac{1}{{{a}^{2}}}\].You need to login to perform this action.
You will be redirected in
3 sec