Respuesta :

f(3) = 2(3)+6
f(3)= 6+6
f(3)=12

Hope this helps!
jay983
Replace f(x) with y
Y=2x-6

Interchange the variables
X=2y-6

Solve for y
Y=3+x/2

F to the negative 1st power (x)=3+x/2