Question

X-1/x=7 then x^4 - 1/x^4 =?

Answer 1

First we need to find the value of x^2-1/x^2

(x-1/x)^2+2×x×1/x ( both x get cancelled)

(7)^2+2

49+2

51

x^4-1/x4

(x^2-1/x^2)^2 (both x^2 get cancelled)

(51)^2+2

2601+2

2603