Réponses

2014-03-29T22:19:15+01:00
Bonsoir,

A = (2x - 3)(x + 1) - 5(4x - 6)
   = (2x - 3)(x + 1) - 5 * 2(2x - 3)
   = (2x - 3) [(x + 1) - 5 * 2]
   = (2x - 3) (x + 1 - 10)
   = (2x - 3) (x - 9)


B = 16x² - 1 - (4x -1)(x - 3)
   = [(4x)² - 1²] - (4x -1)(x - 3)
   = (4x - 1)(4x + 1) - (4x -1)(x - 3)
   = (4x - 1) [(4x + 1) - (x - 3)]
   = (4x - 1) (4x + 1 - x + 3)
   = (4x - 1)(3x + 4)