Which of the following is quadratic equation? (a) x^2-79=x^2+9x+1
(b) 12x^2-7=0
(c) 3x^2+11x+14=x(3x+5x)
(d) -x^2+11x-18=0

a c d

Step-by-step explanation:

a c d are quadratic equation expect "b"

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.

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).