Tolong donggg buat besok ​

Jawab:

f(x) =  2x/ (x + 1)

f⁻¹ (4) = x

f(x) = 4

2x/ (x + 1)= 4

4 ( x+ 1 ) = 2x

4x + 4 = 2x

4x -2x = – 4

2x = -4

x = -2