tentukan f pangkat -1 (x) dari : a) f(x) = 2x + 3 b) f(x) =2x - 7 / 5x + 3

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

b. f(x) = 2x - 7/5x + 3
f(x) = ax + b/cx + d
f^-1(x) = -dx + b/cx -a
= -3x - 7/5x - 2