will give brainliest plz help asap this is my friends question and she needs It soon. Factorise these expressions

Answer:
a. (x+19)(x+1)
b. (z-1)(z-1)
c. 3(2x-3)
Step-by-step explanation:
a. x^2+20x+19
(x+19)(x+1)
b. z^2-2z+1
(z-1)(z-1)
c. 9(x-1)-3x
9x-9-3x
6x-9
3(2x-3)
Answer:
Would have said the same thing!
Step-by-step explanation:
My bad man! I was to late...