Ditentukan f(x) = 5 – 2x, g(x) = x + 6,dan h(x) = x – 4. Jika ( f o g o h)^-1(k) = 2,nilai k adalah…..

f(x) = 5 – 2x, g(x) = x + 6,dan h(x) = x – 4. Jika ( f o g o h)^-1(k) = 2,nilai k = …
h^-1(x) = x + 4, g^-1(x) = x – 6 dan f^-1(x) = -1/2(x – 5)
(fogoh)^-1(x) = (fog)(x+4)
                 = f(x + 4 – 6)
                 = f(x – 2)
                 = -1/2(x-2-5)
                 = -1/2(x – 7)
(fogoh)^-1(k) = -1/2(k – 7)
         2      = -1/2)(k – 7)
         -4    = k – 7
k = 7 – 4 = 3  tidak ada jawaban yang benar di PG nya