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Meilleure réponse !
2013-05-27T20:25:31+02:00

Bonsoir

 

a = (x+2)(x+3) = x²+3x+2x+6 = x² +5x+6

b= (x-4)(x+5) = x²+5x-4x-20 = x² +x -20

c= (x-1)'x-4) = x²-4x-x+4 = x² -5x +4

d = (2x+3)(4x+2) = 8x² +4x +12x +6 = 8x² +16x +6