a –(1/a) = 4 হলে, a3 –(1/a3) কত?

a –(1/a) = 4 হলে, a³ –(1/a³) কত?

A -76

B 76

C -79

D 79

Solution

Correct Answer: Option B

a-(1/a) = 4 হলে, a3-(1/a3)= কত?

a-(1/a) = 4

=> (a-1/a)3= 4