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f(-2) = faktor f(x)
misalkan sisanya:
f(x) = ax + b maka:
2a + b = 5
-2a + b = f(-2)
___________ _
4a = 5 - f(-2)
a = (5 - f(-2))/4
b = 5 - 2(5 - f(-2))/4
= 5 - (5 - f(-2))/2
= (10 - 5 + f(-2))/2
= (5 + f(-2))/2
sisa:
(5 - f(-2))x/4 + (5 + f(-2))/2
2. 6a + b = 0
a + b = f(a)
___________ _
5a = - f(a)
a = - f(a)/5
b = 6f(a)/5
sisa:
- f(a)x/5 + 6f(a)/5 = f(a)/5 (6 - x)