I have $A = (-10, -4)$ and $B = (3, 8)$. And I am trying to write the answer to $A \cup B$. I know the answer is $(-10, -4)$ and $(3, 8)$ but I am unsure how to write an interval range where there is a gap. I have found the notation $(-10,-4) \cup (3,8)$ but this is extremely close to the notation of the question.
Disclosure: This is related to a homework problem