Hi,

sketch IT (Directrix  x = 1 the clue) Parabola opening right

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(2,-1)   Finding value of a

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

  



 

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