Question

Sendo f(x)=6x+8 e g(x)= 2x-4 encontre f(g(3)).

Answer 1

$f(g(x)) = 6(2x - 4) + 8 \\ f(g(3) ) = 12x - 24 + 8 \\ 12x = 16 \\ x = \frac{16}{12} = \frac{4}{3}$
espero ter ajudado.....