The vertex of this parabola is at (-1, -3). which of the following could be its equation? the parabola is going left. a. x = -2(y + 1)2 - 3 b. x = -2(y - 1)2 - 3 c. x = -2(y - 3)2 - 1 d. x = -2(y + 3)2 - 1