Réponses

2014-10-10T21:17:00+02:00
C=2x-7-(-x+2)²(5-4x)=2x-7-(x²-4x+4)(5-4x)=2x-7-(5x²-4x^3-20x+16x²+20-16x)
c=2x-7-5x²+4x^3+20x-16x²-20+16x=4x^3-21x²+38x-27
^ ¦ puissance

-2(3x+5)=7+5
-6x-10=12
6x=-10-12
6x=-22
x=-22/6