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3(2x^2-4x+1) + 5(-2x^2 + 3x + 4)
=6x^2 - 12x + 3 - 10x^2 + 15x + 20
= -4x^2 +3x + 23
kalau (-)
3(2x^2 -4x + 1) + 5( -2x^2 + 3x - 4)
=6x^2 - 12x + 3 - 10x^2+ 15x - 20
= -4x^2 + 3x - 17