Diketahui f(x)=4/2(3-x) ditanya f^-1(4)=

f(x) = 4/2(3-x)
y = 4/(6-2x)
6y - 2xy = 4
-2xy = 4 - 6y
x (-2y) = 4-6y
x = (4-6y)/(-2y)
f^-1(x) = (4-6x)/(-2x)
f^-1(4) = (4-6(4))/(-2(4))
f^-1(4) = (4-24)/-8
f^-1(4) = -20/-8
f^-1(4) = 5/2