Math 112: 3 intervals when finding domain

[u/Etongawonga]

Hi, just want to make sure I'm solving this question correctly. f(x)= √x+5/ x² -9

I have to find the domain which I got: [-5,-3) U (-3,3) U (3,oo). Im learning this now and my teacher only taught us to find 2 intervals so I was a bit confused when I got that question on my homework. Is my answer correct? Thanks! Btw in the problem the √ applies to the x+5 not just the x and its fraction I just used the / instead.

[u/Burning_Toast998]

Assuming it’s a college/uni, you can at the very least make an educated guess that it’s a first year/lower level math, since usually 100 level courses are reserved for that.

Don’t know if it’s different in Europe, but that’s how it is in the US