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3x^2 - 11x + 3 = a(x^2 - x - 2) + bx - b + C
3x^2 - 11x + 3 = ax^2 - (a-b)x - 2a - b + C
identikan kedua ruas, get :
a = 3
a - b = 11
3 - b = 11
b = - 8
- 2a - b + C = 3
-2(3) - (-8) + C = 3
-6+8+C = 3
2+C = 3
C = 1