Help with interval notation:
My prof. Never explained interval notation, so I don't know how to write the answers to these...
a) Determine the domain of the function f(x)= {1}{\sqrt{3 x+12}}
Domain (in interval notation):
Note: Write the answer in interval notation. If the answer includes more than one interval write the intervals separated by the union symbol, U. If needed enter -\infty as - infinity and \infty as infinity .
b) Determine the domain of the function f(x) = {-4}/{x^{2}+8x} .
I know a) is all real numbers except -4, and b) should be non-zero real numbers.

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Can you explain the second one too? I know it has multiple intervals but I'm lost other than that.

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