Bonjour,
Factoriser :
1) B = x² - 8x + 16
B = x² + 2 * 4 * x + 4²
B = (x + 4)²
2) C = 36x² + 96x + 64
C = (6x + 8)²
3) D = (5x - 3)² - 144
D = (5x - 3)² - (12)²
D = (5x - 3 - 12) (5x - 3 + 12)
D = (5x - 15) (5x + 9)
4) E = (9x + 7)² - (4x - 15)²
E = (9x + 7 + 4x - 15) (9x + 7 - 4x + 15)
E = (13x - 8) (5x + 22).
