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kedua fungsi inverskan
g(x) = x+2
y=x+2
x=y-2
g-¹(x) = x-2
f(x) = 15/x
y= 15/x
xy=15
x=15/y
f-¹(x) = 15/x
(g-¹of-¹)(a) =1
(g-¹(15/x) =1
(15/x) -2=1
15/x-2=1 kalikan x
maka
15-2x=x
-2x-x=-15
-3x=-15
x=5
jadi x atau a=5