Definition of quadratic function of one variable?

Quadratic function of one variable: the quadratic curve can be ellipse, hyperbola, parabola. But generally speaking, it refers to the function in the form of y = ax ^ 2 + BX + C (where a is not equal to 0). It is called quadratic function of one variable. 1. Properties when a > 0: (1) the image is open upward. (2) its vertex coordinates are [- B / (2 * a), (4ac-b ^ 2) / (4a)] (

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