What are the domain and range of quadratic function ?
Ex : Find the domain and range of y = x^2 + 6x + 7
To learn, in general, about domain and range, try here
In particular, since you can plug any x-value you like into any
polynomial, you can plug any x-value into a quadratic.
For the range, take a look at the graph; in particular, look for the vertex
, as this demarks the minimum (or, for negative quadratics, the maximum) value of y.