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Bab Fungsi

(g o f)(a) = 7
g(f(a)) = 7
g(2a - 7) = 7
4 - 3(2a - 7) = 7
4 - 6a + 21 = 7
25 - 7 = 6a
a = 18/6
a = 3

f(x) = 2x - 7
g(x) = 4 - 3x

f(a) = 2a - 7
(g o f)(a) = 7
g(f(a)) = 7
g(2a - 7) = 7
4 - 3(2a - 7) = 7
4 - 6a + 21 = 7
25 - 7 = 6a
a = 18/6
a = 3