Bonjour
E = (3x + 8)² + 2 (9x² - 64) = 0
1) Factoriser :
9x² - 64 = (3x)² - 8² = (3x - 8) (3x + 8)
2) Factoriser :
E = (3x + 8)² + 2 (9x² - 64)
E = (3x + 8)² + 2 (3x - 8) (3x + 8)
E = (3x + 8) (3x + 8 + 6x - 16)
E = (3x + 8) (9x - 8)
