Give the domain and range of the multi-variable function
\[f(x,y) = \sqrt{9-x^2 - y^2}\]
Since we are taking the square root we need the result to be ge to 0
\[0\le 9-x^2-y^2\] \[x^2+y^2\le 9\] \[D = \{(x,y)|x^2+y^2\le9\}\]
So the max output is 3 (when x and y = 0)
\[R: [0,3]\]