Question

Need help understanding this problem please

Answer 1

f(g(x)) is a composite function:

`f(g(x))=f(√(x+5))=2√(x+5)-1`

Plug in x = 4:

`f(g(4)) = 2√(4+5)-1=2\sqrt9-1=2\cdot3-1=\boxed{5}`

so the answer is C.