it’s [-4,5] , since the range is the y-values. you start from the least value where your function starts to the greatest where the function ends. all values that are included will have the bracket [ ] and the values that are not included in the function will have the parentheses ( ) . since both -4 (doesn’t show a dot but that just means that it’s included) and 5 have the point that is filled in, then they’re included in the function and have the brackets