Answer
The Domain of the function is $\left( -\infty ,\infty \right)$ and its Range is $\left[ 18,\infty \right)$
Work Step by Step
We have to find the range of the function; we use the vertex of the parabola, which is $\left( -6,18 \right)$.
The parabola has a minimum value at 18. And its maximum value would be $\infty $. Thus, the range of the function is $\left( 18,\infty \right)$.
Hence, the function is defined for all real values of x; thus its domain is $\left( -\infty ,\infty \right)$.
