tentukan f-1(x) dari fungsi berikut ini! b.f(x)=1/2x+2/3 c.f(x)=1-2x/4-x

jawab

f(x) = 1/2 x + 2/3
y = 1/2 x + 2/3....kali 6
6y = 3x + 4
3x = 6y - 4
x= 1/3(6y - 4)
f⁻¹(x) = 1/3 (6x - 4)

f(x) =(1 - 2x)/ ( 4- x)
y = (1 - 2x)/(4 - x)
y(4 - x) = 1 - 2x
4y - xy = 1 - 2x
2x - xy = 1 - 4y
x(2 - y) = (1 - 4y)
x = (1 - 4y)/(2 - y)
f⁻¹(x) = (1 - 4x)/ (2 - x)  atau  f⁻¹(x) = (4x -1)/(x -2)