What is the y-intercept of the quadratic function f(x) = (x – 6)(x – 2)? (0,–6) (0,12) (–8,0) (2,0)

It would be the second choice or letter B - (0,12)

To get the y-intercept, set x as zero. Substitute then simplify. Negative six times negative two would equal to positive twelve.
Set: x = 0
Solution: f(x) = (0 - 6) (0 - 2)
                f(x) = -6 x -2
y = 12

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there