.
I assume that your formula is h(x) = + .
To avoid ambiguity, you should write it as h(x) = (1/sqrt(2x+1)) + sqrt(2x+1)
using PARENTHESES to show the fraction correctly (if the formula is as I assumed).
f(x) = 2x+1;
g(x) = + .
First the function f(x) converts "x" into "2x+1";
Then the function g(x) converts "2x+1" into + .