Question

factorize: (a? - 4a)(a²-4a-1) - 20​

Answer 1

Answer:

Call x=a(a−4) then

x(x−1)−20=x2−x−20=(x+4)(x−5)

then

(a2−4a+4)(a2−4a−5)=(a−2)2(a+1)(a−5)

Step-by-step explanation:

move to brenlist