Réponse :
Bonjour,
A = (2x-8)² = 4x² - 32x + 64
B = 9x² - 49
C = 25x² + 90x + 81
D = 4x² + 4x + 1 + 16x² - 9 = 20x² + 4x - 8
E = (3x-4 - (x-5))(3x+4+x-5)
= (2x - 9)(4x - 1)
= 8x² - 2x - 36x + 9
= 8x² - 38x + 9
