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h(x) = k(x).f(x) +g(x)
h(3) = k(3).f(3) + g(3)
h(3) = k(3).[(3)³-2(3)²-9] + [3²-2(3)-15]
h(3) = k(3).(27-18-9) + (9-6-15)
h(3) = k(3).(0) + (-12)
h(3) = -12 (D)