f(x,y) = ln(9 - x(adsbygoogle = window.adsbygoogle || []).push({}); ^{2}- y^{2})

Domain I got:

(x, y) in R^{2}such that x^{2}+ y^{2}< 9

How do I find the range from the domain?

Wouldn't it be all positive numbers of ln such that it is less than ln(9)?

Answer says less than or equal to 9, I don't get why.

Any input is appreciated!

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# Finding the range of this function of 2 variables:

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