Réponses

2013-11-29T00:04:08+01:00
A) F = (3x-5)²-(3x-5)(x+4)
F = 9x²-30x+25-(3x²+12x-5x-20)
F = 6x²-37x+45

b) 
F = (3x-5)²-(3x-5)(x+4)
F = (3x-5)[(3x-5)-(x+4)]
F = (3x-5)(2x-9)

c) F = (3x-5)(2x-9)
F = (3-5)*(2-9)
F = 14

F = (3x-5)(2x-9)
F = (13,5-5)(9-9)
F = 0