An equation of a parabola is given. (y + 2)2 - -3x + 15 (a) Find the vertex, focus, and directrix of the parabola. vertex ( x, y ) = focus ( x, y ) = directrix (b) Sketch a graph showing the parabola and its directrix. 15 10 10 15 15 - 10 10 15 -15 - 10 -5 -5 -10 -10 C -15 } -15 15 15 LO 10