Definition: A quadratic expression is an expression of the form: a x^{ 2} + b x + c,where x is a variable and a, b, and c are constants, and a is not equal to zero. The term a x^{ 2} is called the quadratic term, b x is called the linear term and c is called the constant term. The constant a is called the leading coefficient, b is called the linear coefficient, and c is called the additive constant. |
a x^{ 2} + b x + c
a x^{ 2} + b x + c = 0.(Note that setting y = 0 in the graph means that we are looking at points where the parabola crosses the x axis, and setting f (x) = 0 in the quadratic function means that we are looking for values of x for which the output of the quadratic function is zero.)