If f (x) = (x-1) / (x+1), evaluate f^-1 ((1/c) + 1)

A-1 = a ((1/c) + 1) + 1hello:

f (a) = b ... a = f^-1 (b)

in this exercice : b = (1/c) + 1

solve equation:

f (a) = (1/c) + 1

(a-1) / (a+1) = (1/c) + 1

a-1 = (a+1) ((1/c) + 1)

a - a ((1/c) + 1) = 2

a (1 - (1/c) - 1) = 2

a = ((-1-2c) / c) / 2

f^-1 ((1/c) + 1) = (-1-2c) / 2c