Question

MATHS
(X-1/X)=9 FIND X^4+1/X^4

Answer 1

the answer of the ques. is 6887

Answer 2

=>x-1/x = 9

take squares

=>(x-1/x)^2 = 81

=>x^2 + 1/x^2 +  2 = 81

=>x^2 + 1/x^2 = 79

take squares

=>x^4 + 1/x^4 + 2 = 79^2

=>x^4 + 1/x^4 = 6239