Question

Алгебра................... ​

Answer 1

Ответ:

$4)\ \ f(x)=\dfrac{3}{x+2}\ \ ,\ \ \ \ g(x)=3x+4\\\\\\z(x)=g(f(x))=3\cdot f(x)+4=3\cdot \dfrac{3}{x+2}+4=\dfrac{9}{x+2}+4=\dfrac{4x+17}{x+2}\\\\z(x)=\dfrac{4x+17}{x+2}$