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(f o f) (x) = 9x - 8
f (f(x)) = 9x - 8
f(ax + b) = 9x - 8
a(ax + b) + b = 9x - 8
a²x + ab + b = 9x - 8
a²x + (ab + b) = 9x - 8
a² = 9 dan ab + b = - 8
a = √9
a = 3
ab + b = - 8
3b + b = - 8
4b = - 8
b = -8/4
b = - 2.
f(x) = 3x - 2
f^-1(x) = (x + 2)/3
(f^-1)² (x) = (f^-1 o f^-1) (x)