x+1/x=4 হলে x³+1/x³ =কত?

A 52

B 64

C 76

D 80

Correct Answer: Option A

দেওয়া আছে ,x+1/x=4
x³+1/x³=(x+1/x)³-3.x.1/x(x+1/x)
          =(4)³-3.4
           =64-12
           =52