mohon dibantunya! 1. tentukan f^(-1) (x) dari fungsi berikut ini! a. f(X) = 1/2 x +2/3 b. f(X) = (1-2x)/(4-x) 2. jika f(X) = 3x5x,g(X)=4x+7 tentukan: a. (f.g)^

1).
a. f(x) = 1/2 x +2/3
misal y = 1/2 x +2/3
1/2x = y - 2/3
x = 2y - 4/3
f^-1(x) = 2x -4/3

b. f(x) = (1-2x)/(4-x)

misal y = (1-2x)/(4-x)
y (4 - x) = 1 - 2x
4y - yx = 1 - 2x
2x - yx = 1 - 4y
x (2 - y) = 1 - 4y
x = (1 - 4y)/ (2 - y)

f^-1(x) = (1 - 4x) / (2 - x)