A quadratic function is a function of the form <math>f(x)=ax^2+bx+c</math>, where a is nonzero.
In the case where the domain and codomain are R (the real numbers), the graph of such a function is a parabola.
... physical quantities accurately is important in science, engineering and commerce.
For example, the unit for length might be a well-known person's foot, and the length ...
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