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=> x1 + x2 = (a + 2) + (b + 2) = (a + b) + 4 = (-6) + 4 = -2
=> x1 * x2 = (a + 2)(b + 2) = a * b + 2 (a + b) + 4 = -5 + (-12) + 4 = -13
jadi jawaban yang paling tepat adalah [c]