Tentukan :
a. Nilai a dan b
Jawab:
2a + b = 13
5a + b = 22
_________ -
- 3a = - 9
a = 3
b = 7
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Hitunglah nilai f(3)
Jawab: f(3) = 3(3) + 5 = 14
2) f(x) = 2x - 1
maka f(x - 1) = ...
Jawab:
f(x - 1) = 2(x - 1) - 2 = 2x - 4
3) f(x) = ax + 2
jika f(2) = 4
maka rumus fungsi tersebut adalah ...
f(2) = 4
2a + 2 = 4
2a = 2
a = 1
Rumus fungsi: f(x) = x + 2
4) Fungsi f dinyatakan dengan rumus f(x) = ax + b, jika f(2) = 13 dan f(5) = 22.
Tentukan :
a. Nilai a dan b
Jawab:
2a + b = 13
5a + b = 22
_________ -
- 3a = - 9
a = 3
b = 7