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Sagot :

Réponse :

Bonjour,

1. A = 2+2x /  4 = (1+x)/2

2. B =x² -6x+9-(x-3)

= (x-3)² - (x-3)

= (x-3)(x-3-1)

= (x-3)(x-4)

3. C = 4x² -9(x+1)²

=(2x)² - [3(x+1)]²

= [2x-3(x+1)][2x+3(x+1)]

= (2x-3x-3)(2x+3x+3)

=(-x-3)(5x+3)

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