Factor the polynomial by grouping 18x^3+15x^2+24x+20

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

this is a good question! i'll do some research and come back when i have the answer!