Question

Encontre a composta f(g(x)) das seguintes funções:
f(x)=$\frac{3x}{1+x}$ e g(x)= $\sqrt{x}$ 

f(x)= b+2x e g(x)= $\frac{-x}{2}$

Answer 1

a)

f(g(x)) = 3*g(x) /(1+g(x)) =3*√x /(1+√x)

g(f(x)) =√[f(x)]=√[3x/(1+x)]

b)

f(g(x)) =b + 2 *g(x) = b+ 2 * (-x)/2 =b-x

g(f(x))=-f(x)/2  =-[b+2x]/2