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Quadratic functions are second-order equations of the form y=ax^2+bx+c.  Their graphs form parabolas. The defining characteristic of a quadratic is that the acceleration of the outputs is a constant.
A quadratic function: f(x) = ax2 + bx + c
 A, b, and c are not equal to zero.
Graph of a quadratic function is a curve called a parabola. 

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