A.b.in the formula of parabola in quadratic function

A.b.in the formula of parabola in quadratic function

In the formula of parabola in quadratic function, A.B.C is the coefficient of quadratic term, the coefficient of primary term and the constant term respectively. The opening of a > 0 parabola is upward and that of a < 0 parabola is downward. X = - B / 2a is the symmetry axis of parabola. C is the ordinate of the intersection of parabola and Y axis