Given the directrix: y = -2 , find the standard form of the equation of the parabola

given the directrix y= -2 , find the standard form of the equation of the parabola
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y=-2 is a horizontal line so the parabola is vertical (axis of symmetry is perpendicular to the directrix) and has the general form y=a(x-h)2+k where (h,k) is the vertex and a=1/(4f) where f is the vertical focal distance (distance between focus and vertex, and vertex and directrix line). 

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