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s22x Said,
February 5th, 2011 @10:37 pm  

that form is called “vertex form”, where h,k is the vertex of the quadratic/parabola. you would then use a to see whether it opened up or down and the rate it increased.
to do this, you would plot a point at h,k, and then just test another point on the graph. since a quadratic has symmetry over the vertical line at the vertex, you would really have discovered 2 points. then just draw in the quadratic

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