domain is the numbers you can use
see, we have -1≤x<0 and 0≤x<5
so if it is in the range of -1 to 5, then it is in the function
it includes -1 but not 5 because we gots -1≤x but x<5
remember, in interval notation, [] is includes and () is not include
or
[] is ≤≥ and () is <>
so
[-1,5)
