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Create Free AccountA quadratic function has the form f(x) = ax² + bx + c, where a ≠ 0. Its graph is a parabola. If a > 0, it opens up (minimum). If a < 0, it opens down (maximum). The vertex is the turning point.
For f(x) = ax² + bx + c, the x-coordinate of the vertex is x = -b/(2a). Plug this value back into the function to find the y-coordinate. The vertex is the maximum or minimum point.