Hi

Using the vertex form of a parabola,  where(h,k) is the vertex

 y = (x - 3)(x + 4)

 y = x^2 + x - 12  |expanding

 y = (x +1/2)^2 - 1/4 - 12  |completing the square

 y = (x + 1/2)^2 - 49/4   Vertex is Pt(-1/2,-49/4), line of symmetry x = -1/2



 

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