Question

Sendo f(x)= 5x-2 e f(g(x))=3x+1, obtenha g(x)

Answer 1

f(x)= 5x - 2
f(g(x)) = 5g(x) - 2
Mas f(g(x)) = 3x + 1 

Logo: 5g(x) = 3x + 1

g(x) = 3x/5 + 1/5

Answer 2

5(3x+1) -2=  15x+5-2=  15x+3=   3/15