In the given function f(x) = √(x+3) when drawn graphically we see that the graph has a growth starting form x=(-3).This can be evaluated by drawing a tangent on every point of the graph.
Here the graph is increasing form (-3) to ∞ which is the domain of the function.
Therefore the function is increasing over the interval of [-3, ∞).
, we have 
and 
, so
and 
, we get 
and 
, we have 
, so
