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Verified answer
Karena deret aritmetika, maka membentuk barisan :a, a + b, a + 2b
a + 2b = 3a
2a = 2b
a = b
a + (a + b) + (a + 2b) = 12
a + (a + a) + (a + 2a) = 12
6a = 12
a = 2
a = 2, b = 2
maka, barisan aritmetikanya adalah :
2, 4, 6
f(x) = (x - 2)(x - 4)(x - 6)
= (x^2 - 6x + 8)(x - 6)
= (x^3 - 12x^2 + 44x - 48)
Dibagi dengan x^2 + 1, maka akan bersisa 43x - 36