Question

Function help? I don't understand what to do?

Answer 1

same as f( f(x) )

Answer 2

f(x) plugged back into f(x)

Answer 3

We are asked to evaluate "f of f of x". In other words f(f(x)).
If \[f(x) = x^2 + 4\]
Then f(f(x)) is found by replacing each instance of x in \[x^2 + 4\] with another \[x^2 + 4\]

That is:
\[f(f(x)) = f^2(x) + 4 = (x^2+4)^2 + 4\]

Answer 4

@teslarealm @timo86m Does that mean it's C or D?