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document.write( "Hi,
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document.write( "sketch IT (Directrix x = 1 the clue) Parabola opening right
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document.write( "the vertex form of a Parabola opening right(a>0) or left(a<0), 
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document.write( " where(h,k) is the vertex and y = k is the Line of Symmetry
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V(2,-1) Finding value of a
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document.write( "p(distance of the directrix and focus left 0r right of vertex) = 1, a = 1/4p = 1/4
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