Réponses

2014-04-17T09:46:30+02:00
A=(2x+1)²+(2x+1)(3x-4)
A=(4x²+4x+1)+(6x²-8x+3x-4)
A=10x²-x-3

A=(2x+1)²+(2x+1)(3x-4)
A=(2x+1)((2x+1)+(3x-4))
A=(2x+1)(5x-3)

(2x+1)(5x-3)=0
⇔2x+1=0 ou 5x-3=0
⇔x=-1/2 ou x=3/5