tolong kasi jawapan yang saya foto..pliss thankss

f (x) = (2x + 1)/(3x + 4)
y = (2x +1)/(3x +4)
(3x + 4)y = 2x + 1
3xy + 4y = 2x + 1
3xy - 2x = -4y +1
(3y - 2)x = -4y + 1
x = (-4y + 1)/(3y - 2)
f-1(x) = (-4x + 1)/(3x - 2)
f-1(3) = (-4.3 + 1)/(3.3 -2)
= (-12 + 1)/(9 -2)
= -11/7....(A)