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What is the formula to find the minimum or maximum value of a quadratic function?
Just differntiate it w.r.t x once and equate it to zero and then solve it for values of x.U would get one value of x always for a quadratic.At that point the function would be either maximum or minimum.Just put that x value into the quadratic function to get that value.To know that the point is maxima or minima differentiate once more if it would be a constant.If it would be negative then it is maxima otherwose it is minima.
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