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f(x) = x² - 3x + C
f(b) - f(1) = 12
(b² - 3b + C) - ((1)² - 3(1) + C) = 12
b² - 3b + 2 = 12
b² - 3b -10 = 0
(b-5)(b+2) = 0
b= 5 dan b= -2, karena b>0, maka b= 5