No 28 pakai jalan tolongg^^

f(x+4)=2x + 9 / x+1
misal
t = x+4
x= t-4
f(x) = 2(t-4)+9 / t-4+1
=2t+1 / t-3

f(x) = 2x+1 / x-3
inversnya
y = 2x+1 / x-3
y(x-3)= 2x+1
yx-3y=2x+1
yx-2x=3y+1
x(y-2) = 3y+1
x= 3y+1 / y-2
f-¹(x) = 3x+ 1 / x-2
opsi jawaban A