Hi,

sketch IT (Directrix  x = 15 the clue) Parabola opening left a < 0

the vertex form of a Parabola opening right(a>0) or left(a<0), 

 where(h,k) is the vertex and  y = k  is the Line of Symmetry

  V(0,0)   Finding value of a

p(distance of the directrix and focus left 0r right of vertex) = 15, a = 1/4p = -1/60 as a < 0

  

 

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