x-1/x =2 হলে   x4+1/x4  = কত?  

A    34

B    32

C    31

D    30

Solution

Correct Answer: Option A

 

X2 + 1/x2 = (x – 1/x)2  + 2*x*1/x

= (x-1/x)2 + 2

= (2)2 + 2

= 4 + 2 = 6

আবার,

X4 + 1/x4 = (x2 + 1/x2)2  - 2*x2*1/x2

              = 62 – 2

              = 36 – 2

              =  34

Practice More Questions on Our App!

Download our app for free and access thousands of MCQ questions with detailed solutions