Exercice 2 Factorisation.

En reconnaissant des facteurs communs, factoriser les expressions suivantes

1. 7x + 21

2. 24x²-12x
3. 5(x + 1) + x(x + 1).

4. 3(x-2)(x - 5) + (x - 5)².

À l'aide des identités remarquables, factoriser les expressions suivantes

5. x² +10x + 25.
6. 9x²-6x+ 1.
7. 25x² - 81.​
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