what does it mean and how does it work?
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Are you sure it's not supposed to be $\displaystyle y=a(x-h)^2+k$ If so, then you're dealing with an equation for a parabola in its vertex form, with the vertex at point (h,k) - Note the change in sign of the x-coordinate.
Originally Posted by positiveion what does it mean and how does it work? This is the equation of a quadratic function with the zeros x = h or x = k. The factor a forms the graph of this function (a parabola) depending of sign and value.
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