{a - (1/a)} = 3 হলে, {a2 + (1/a2)} কত ?

{a - (1/a)} = 3 হলে, {a² + (1/a²)} কত ?

A 7

B 9

C 11

D 13

Solution

Correct Answer: Option C

{(a²+1)/a²}

= {(a-1)/a}² + 2.a. 1/a

= 3² + 2

= 9 + 2

= 11