Bonjour !
H = (5x - 8) - (5x - 8)(2x - 7)
H = (5x - 8) [1 - (2x - 7)]
H = (5x - 8)(1 - 2x + 7)
H = (5x - 8)(8 - 2x)
H = 2(5x - 8)(4 - x)
J = (9x + 5)(4x - 7) - (9x + 5)²
J = (9x + 5)(4x - 7) - (9x + 5)(9x + 5)
J = (9x + 5) [(4x - 7) - (9x + 5)]
J = (9x + 5)(4x - 7 - 9x - 5)
J = (9x + 5)(-5x - 12)
J'espère t'avoir aidé. Bon courage !
