The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.
Locate the vertex of the parabola.
Reorder and .
Use the vertex form, , to determine the values of , , and .
Since the value of is negative, the parabola opens down.
Find the vertex .
The range of a parabola that opens down starts at its vertex and extends to negative infinity.
Determine the domain and range.
Find the Domain and Range f(x)=9-(x-1)^2