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#### Chipset3600

##### Member

- Feb 14, 2012

- 79

1- Determine and plot the domain of the function of two variables

a) [TEX]f(x,y)=\sqrt[]{1+x^{2}+y^{2}}[/TEX]

[TEX]x^{2}+y^{2}\geq -1[/TEX] doing [TEX]x^{2}+y^{2}= -1[/TEX] i guess this is the graph of Hyperbole, but my teacher said is a circumference with radius "-1", whel i said but radius is a size, can't be negative, and he told me to think.

does someone can explain to me?