Iam stuck on this problem. find the equation of the parabola given that the vertex is (-2,-20) and the y-intercept is (0,-12). the part where i input the answer is written as _x^2 + _x + _. however, for the last term i keep getting -12 but the last term is positive in the answer choice. i've used both equations of y-k = a(x-h)^2 and also the equation y=ax^2+bx+c.