Réponses

2013-10-18T00:32:44+02:00
3(x-10)(x+10)+(2x+5)(x-3) = 3(x^2 - 100) + (2 x^2 + 2 x - 15) = 3 x^2 - 300 +  2 x^2 + 2 x - 15 = 5 x^2 + 2 x - 315
3(x-10)(x+10)+(2x+5)(x-3)=3(x²-100)+2x²-6x+5x-15=3x²-300+2x²-x-15=5x²-x-315