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= (6x + 1) + (2x^2 - 5)
= 2x^2 + 6x - 4...... B
(2f - 3g)(x) = 2f(x) - 3g(x)
= 2(6x + 1) - 3(2x^2 - 5)
= 12x + 2 - 6x^2 + 15
= -6x^2 + 12x + 17...... C dan D