FUNGSI KOMPOSISI
f(x) = a = x + 1 → x = a - 1
g(f(x)) = g(a) = 3x - 2
g(a) = 3(a - 1) - 2
g(x) = 3x - 5
f(g(x))
= f(3x - 5)
= 3x - 5 + 1
= 3x - 4 ✔
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FUNGSI KOMPOSISI
f(x) = a = x + 1 → x = a - 1
g(f(x)) = g(a) = 3x - 2
g(a) = 3(a - 1) - 2
g(x) = 3x - 5
f(g(x))
= f(3x - 5)
= 3x - 5 + 1
= 3x - 4 ✔