Question: Given the function z ( x , y ) = x 2 + y 2 - 4 Find the domain and range of f (

Given the function
z(x,y)=x2+y2-4
Find the domain and range of f(x,y). Hence, sketch the level curve of the function for z=0 and z=5.
Given the function z ( x , y ) = x 2 + y 2 - 4

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