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f(x) = 2x^2+8x-10, g(x) = -3x^2+6x+12 Find the coordinates vertex of a parabola W(p,q) and draw an approximate graph of function f(x). From the graph it is easy to see that the image of the quadratic function is the interval [-18,∞). Answer: The image of the quadratic function is the interval [-18,∞).