Réponses

2013-12-10T19:08:16+01:00
1) (2x+3)²+(2x+3)(7x-2)
4x²+12x+9+14x²-4x+21x-6
18x²+29x+3
2)(2x+3)(2x+3)+(7x-2)
(2x+3)(9x+1)
3) x=-4
(2(-4)+3)(9(-4)+1)
(-8+3)(-36+1)
(-5)(-35)=175