F [tex](5x - 1) = 2x + 3 \: tentukan \: f(9)[/tex]

f(5x-1) = 2x +3
misalkan u = 5x-1
maka x = (u+1)/5

f(u) = 2((u+1)/5) + 3
f(u) = 2u+2/5 + 3
f(u) = (2u+17) / 5
f(x) = (2x+17) / 5
f(9) = (2(9)+17) / 5
f(9) = 35/5 = 7

semoga membantu
ㅡ :)