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b) (a+ 3) (4 - 3a) = 4a -3a^2 +12 - 9a = -3a^2 -5a +12
c) 2 (x-1)(3x+1) = (2x -2)(3x + 1)= 6x^2 +2x -6x -2 = 6x^2 -4x -2