3 f(x) 0 1 2 3 -1- +g(x). 4 LO 5 6 7 8 X -21 Find the domain of the function fg. (Give your answer as an interval in the form (*,*). Use the symbol co for infinity, U for combining intervals, and an appro type of parenthesis "(",")", "[""]" depending on whether the interval is open or closed. Enter if the interval is empty. Exp numbers in exact form. Use symbolic notation and fractions where needed.) domain of fg: