Hi, x^2 - 8x-16y+16 =0 x^2 - 8x = 16y-16 (x-4)^2 = 16y - 16 + 16 (x-4)^2 = 16y y = (1/16)(x-4)^2 V(4,0) x = 4 line of symmetry , p = 4, focus(4,4), y = -4 directrix