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I am confused a bit in functions.

Consider a function f(x)=x^2 . Putting various values of x here will give corresponding values of f(x) or y because y=f(x). OK

Now consider a function f(x,y)= x^2 + y^2 . Now putting here values of x and y will give value of f(x,y). Now what is f(x,y) here????? Above f(x) was y or distance from x axis. What is f(x,y)

here then. Is itzthen?

If yes, then consider a function f(x,y,z) = x^2 + y^3 + z^2, then what is f(x,y,z) here?????????????

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# Function of more than one variables

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