y^2 + 2y + 12x + 25 = 0
Subtract y^2 + 2y + 25 from both sides
12x = -y^2 - 2y -25 divide both sides by 12
x = (-1/12)y^2 - (1/6)y - 25/12 this is the general form
y^2 + 2y + 12x + 25 = 0
Now....let's find the vertex form
Subtract 12x, 5 from both sides
y^2 + 2y = -12x - 25
Complete the square on y
Take (1/2) of 2 = 1....square this = 1^2 = 1 and add to both sides
y^2 + 2y + 1 = -12x - 25 + 1
y^2 + 2y + 1 = -12x - 24 factor both sides
(y + 1)^2 = -12(x + 2)
-12(x + 2) = (y + 1)^2
And this is in the vertex form 4p(x - h) = (y - k)^2