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2(1/8) + 7(1/4) + 1/2 a - 3 = 0
1/4 + 7/4 - 3 + 1/2 a = 0
-1 + 1/2 a = 0 ---> a = 2
f(x) = 2x³ + 7x² + 2x - 3 = (2x-1)(x+3)(x+1)
faktor lainnya = (x+3) atau (x+1)