A = x*2x + x-3 + 5*2x + 5*3 = 2x²+3x+10x+15 = 2x²+13x+15
B = 9x*4x + 9x*(-6) - 12*4x - 12*(-6) = 36x²-54x-48x+72 = 36x²-102x+72
puis
A = 4x * x + 4x * (-9) = 4x(x-9)
B = 7 * x + 7 * (-1) = 7 (x-1)
C = (x-1) [(x+2) + (2x+3)] = (x-1) (3x+5)
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A = x*2x + x-3 + 5*2x + 5*3 = 2x²+3x+10x+15 = 2x²+13x+15
B = 9x*4x + 9x*(-6) - 12*4x - 12*(-6) = 36x²-54x-48x+72 = 36x²-102x+72
puis
A = 4x * x + 4x * (-9) = 4x(x-9)
B = 7 * x + 7 * (-1) = 7 (x-1)
C = (x-1) [(x+2) + (2x+3)] = (x-1) (3x+5)