J'ai besoin d'aide svp: Exercice n°5: 1. Soit A = 3x + 6 et B = (x - 1) (x + 2)
a. Factoriser A.
b. En déduire que B - A = (x + 2) (x-4)
2. Développer C = (2x - 3)( -5 + 2x) - 4 + 6x
3. Démontrer que (2x + 1)² - 4 = (2x + 3)(2x - 1)​
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