Question

If g(x) = √x+1 & f(g(x)) = 3-√x+1 then f(0) = ?

Answer 1

The correct answer is 3.

For $f(0)$ put x=-1 in f(g(x))

$\therefore$ $f(g(-1))=3+\sqrt{-1+1}$

$\Rightarrow f(0)=3$