Ineed a parabola can be represented by the equation y2 = –x. what are the coordinates of the focus and the equation of the directrix? a) focus: (-1/4,0) ; directrix: x = 1/4 b) focus: ( 1/4,0) ; directrix: x = - 1/4 c) focus: (–4,0); directrix: x = 4 d) focus: (4,0); directrix: x = –4