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===Coefficients===
The [[coefficients]] of a polynomial are often taken to be real or [[Complex quadratic polynomial|complex number]]s, but in fact, a polynomial may be defined over any [[ring (mathematics)|ring]].{{Citation needed|date=October 2022}}
===Degree===
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\end{align}</math>
so the vertex, {{math|(''h'', ''k'')}}, of the parabola in standard form is
: <math> \left(-\frac{b}{2a}, c - \frac{b^2}{4a}\right). </math>{{Citation needed|date=October 2022}}
If the quadratic function is in factored form
:<math>f(x) = a(x - r_1)(x - r_2) \,\!</math>
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