Dicari dulu f(x)nya Lalu Substitusi x=-2

f(x) = (2x-3) / (4x+1) , x ≠ -¼

misalkan f(x) = y, maka

y = (2x-3) / (4x+1)

y(4x+1) = 2x-3

4xy+y = 2x-3

4xy-2x = -y-3

x(4y-2) = -y-3

x = -y-3 / (4y-2)

f-¹(x) = (-x-3) / (4x-2)

f-¹(-2) = (2-3) / (-8-2)

f-¹(-2) = -1 / -10

f-¹(-2) = 1/10 (E)