quadratic
quadraticA function of the form y = ax2 + bx + c, where a ≠ 0, so that the highest power of x appearing is its square. The quadratic equation ax2 + bx + c = 0 can always be solved by use of the formula These roots are real and distinct if b2>4ac, real and equal if b2 = 4ac, and complex if b2<4ac. The graph of a quadratic function is a parabola. A quadratic with a > 0 always has a minimum where x = −b/2a, and a quadratic with a < 0 always has a maximum where x = −b/2a.
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