"The standard form is (x - h)2 = 4p (y - k), where the focus is (h, k + p) and the directrix is y = k - p "
3= k+p and 1 = k-p
add together to get 4 = 2k k = 2 (and p =1) vertex is then h, k = 4,2
fill in the form
(x-4)^2 = 4(1)(y-2) expand
x^2 -8x+16 = 4y-8 solve for y
y = 1/4 x^2 -2x +6 a * b * c = -3