Question

(x² - 4x) (x² - 4x - 1)​

Answer 1

Answer:

Step-by-step explanation:

(x^2–4x)(x^2–4x-1)-20. Let (x^2–4x)=p. = p.(p-1)-20. = p^2 -p -20. = p^2 -5p + 4p -20. = p (p-5 ) + 4 (p - 5 ). = (p - 5 ) (p + 4 ). put p = x^2 -4x.