Réponses

2013-03-24T15:44:59+01:00
2013-03-24T16:46:48+01:00

1)(3x-5)(3x-5)-(3x-5)(6x+2)

(9x²-15x-15x+25)-(18x²+6x-30x-10x)

(9x²-15x-15x+25-18x²-6x+30x+10)

9x²-18x²-15x-15x-6x+30x+25+10

-9x²-6x+35

2)(3x-5) [(3x-5)-(6x+2)]

    (3x-5) [3x-5-6x-2]

    (3x-5) [-3x-7]