Question

Factorise :x2+1/x2-4(x-1/x)​

Answer 1

Step-by-step explanation:

(x 2 −4x)(x 2 −4x−1)−20

let (x²−4x)=P

P(P−1)−20

P²−P−20

P²−5P+4P−20

P(P−5)+4(P−5)

(P+4)(P−5)

put P=x 2 −4x

(x²−4x+4)(x²−4x−5)

(x−2) 2(x+1)(x−5)