How do you factor x^2-5x+4 for the answer

Hi there!
In order to factor, start by knowing the variables for each term in the equation ax^2+bx+c
A=1
B=-5
C=4
(Based on the given equation)
In order to factor, we need to find two numbers that add to the b term (-5) but multiply to the c term (4)
-4*-1=4
-4+-1=-5
Therefore, the factored form would be y=(x-4)(x-1)

Hope this helps!