Question

x^2 +1/x^2-11 factorise​

Answer 1

x2+1/x2 -11

= (x)2+ (1/x)2 - 2 - 9

= (x)2+ (1/x)2 - 2*x*1/x - (3)2

= (x - 1/x)2- (3)2

= (x - 1/x + 3) (x - 1/x - 3).