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![]() ![]() ![]() Intercept form of a quadratic function is Two other useful forms for quadratic functions are given below. The axis of symmetry is the vertical line x = -b/2a.The x-coordinate of the vertex is -b/2a.The parabola opens up if a > 0 and opens down if a 1.The graph of y = ax 2 + bx + c is a parabola with these characteristics : The graph of the more general function y = ax 2 + bx + c is described below. ![]() In general, the axis of symmetry for the graph of a quadratic function is the vertical line through the vertex. The graphs of y = x 2 and y = -x 2 are symmetric about the y-axis, called the axis of symmetry. ![]()
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