Question 765976
f(x)= square root 2x+1 
g(x)=x+3
solve for g(f(x)) 
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Sub f(x) for x in g(x)
f(x) = sqrt(2x+1)
g(x) = f(x) + 3
{{{g(f(x)) = sqrt(2x+1) + 3}}}