F(x) = x^2+4xg(x) = -2+√x+4(gof)(x) = ???

(g o f)(x) = g(f(x))
= g(x² + 4x)
= -2 + √(x² + 4x + 4)
= -2 + √(x + 2)²
= -2 + x + 2
= x