Réponses

2014-05-11T12:51:37+02:00
Bonjour

A = (x+3)²+ (5x-2)
A = x² + 6x +9 +5x -2
A = x² +11x +7

B = (4x+2)(x+8) +(x-1)²
B = 4x² + 32x +2x + 16 + x² - 2x +1
B = 5x² +32x +17

E = x² - (6 -x)(4-x)
E = x² - (24 - 6x -4x +x²)
E = x² -24 +6x +4x -x²
E = 10x -24

10x -24 = 0
10x = 24
x = 24/10
x = 12/5

A = 4x² -12x +9 - (7 -3x)(2x -3)
1) 4x² -12x +9 = (2x -3)²
2) (2x-3)(2x-3-7+3x)
(2x-3)(5x -10)