Question

factories: (x^2-4x)(x^2-4x-1)-20​

Answer 1

Step-by-step explanation:

Let x^2-4x=t

t(t-1)-20

t^2-t-20

t^2-5t+4t-20

t(t-5)+4(t-5)

(t-5)(t+4)

put the value of t in the equation

(x^2-4x-5)(x^2-4x+4)

(x+1)(x-5)(x^2-4x+4)