Réponses

2014-04-22T17:03:28+02:00
Bonjour

P = (x-2)(2x+1) - (2x +1)²
P = 2x² + x - 4x -2 - (2x² +4x +1)
P = 2x² +x -4x -2 -2x² -4x -1
P = -7x -3

p = ( (2x+1)(x-2 - 2x -1)
P = (2x+1)(-x -3)

(2x+1)(x +3) = 0
soit 2x +1 = 0
2x = -1 et x = -1/2
soit x +3= 0 et x = -3
si x = -2/3
P = (-4/3 +1) ( 4/3 -3)
P = (-4/3 + 3/3) ( 4/3 - 9/3)
p = -1/3 : - 5/3
P = -1/3 x -3/5 = 3/15 ou 1/5