Question

factorise (x^2-4x) (x^2-4x-1)-20​

Answer 1

above is the answer of your question

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Answer 2

Answer:

(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) square (x+1)(x−5)

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