How to find range of quadratic divided by quadratic?
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The graph of any quadratic function, of the form f(x) = a x 2 + b x + c, which can be written in vertex form as follows f(x) = a(x - h) 2 + k , where h = - b / 2a and k = f(h) is either a parabola opening up, when a > 0, or a parabola opening down, when a < 0 (see graphs of several quadratic function below).
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a must be greater than 4
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