Question

Dados f(x)= 3x+5 e g(x)= 2x-3, o valor de x quando f(g(x))=0 eh?

Answer 1

$f(x)=3x+5\\g(x)=2x-3\\f(g(x))=3(2x-3)+5=6x-9+5\\6x-4=0\\6x=4\\\\x=\frac{4}{6}=\frac{2.2}{3.2}=\boxed{\frac{2}{3}}$