(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In this example, the range is stated to be z=[0,3].

It shows 9-x^2-y^2<=9 which implies sqrt(9-x^2-y^2)<=3

But why don't we consider -3 as well?

Thanks

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# Range of 2 variable function

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