Answer:
B x ≥0
Explanation:
We have to find where each term is valid
sqrt(5x) ≥0
Square each side
5x ≥0
Divide by 5
x ≥0
sqrt(x+3) ≥0
Square each side
x+3≥0
Subtract 3 from each side
x+3-3 ≥0-3
x ≥-3
The first is more restrictive so that is the one we use
x ≥0