Misalkan fungsi f(x)=2x-10 tentukan f(3x+15)

f(x)=2x-10
f(3x+15)=2(3x+15)-10
=6x+30-10
=6x+20
6x=20
x=20/6
x=3,33

f(x) = 2x - 10
f(3x+15 ) = 2(3x+15) - 10
= 6x +30 -10
= 6x + 20
dah, cuma gitu aja

Semoga membantu ya...