# Thread: Finding the domain of a function in interval notation?

1. ## Finding the domain of a function in interval notation?

[(sqrt(3x+12))/x ] - (1/x+3)

I tried this question and got [-4,-3) U (0,infinity)
it's not right though... what am i doing wrong?

2. Originally Posted by vecoma
[(sqrt(3x+12))/x ] - (1/x+3)

I tried this question and got [-4,-3) U (0,infinity)
it's not right though... what am i doing wrong?
Since you do not show any working for how you got your answer, it is impossible to know what you're doing wrong.

You require $3x + 12 \geq 0$, excluding values of x for which x = 0 and x + 3 = 0 ....