quadratic function
A function of the form y = f(x) = ax2 + bx + c, in which a symbol not equal 0.

The graph of such a function is a parabola with its axis parallel to the y-axis. The graph opens upwards if a > 0. Otherwise, it opens downwards. The roots of this quadratic equation, if any, determine where the graph intersects the x-axis. The position of the vertex is normally obtained by completing the square.

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