Fungsi
Matematika dan Ilmu Alamiah Dasar
Fungsi
1) f(x) = x + 5
g(x) = 2x-3
f ° g(x) = f (g(x)
f(2x-3)
= x+5
= (2x-3) + 5
= 2x-3 + 5
f ° g(x) = 2x + 2
g ° f(x) = g (x+5)
= 2x - 3
= 2(x+5) - 3
= 2x + 10
= 2x + 7
Latihan soal
f(x) = 2x-1
g(x) = x+6
h(x) = 7+2x
k(x) = 3 + 5x
1. f ° g = ?
2. g ° h = ?
3. k ° g = 3 + 5 (x + 6)
3 + 5x + 30 = 5x + 77
4. k ° h = ?
5. h ° f = ?
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