Réponse:
x^2-36=x^2-6^2=(x-6)(x+6)
5x-3x^2=x(5-3x)
3x-12=3(x-4)
25a^2-1=(5a)^2-1^2=(5a-1)(5a+1)
21x^2-14x=x(12x-14)
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Réponse:
x^2-36=x^2-6^2=(x-6)(x+6)
5x-3x^2=x(5-3x)
3x-12=3(x-4)
25a^2-1=(5a)^2-1^2=(5a-1)(5a+1)
21x^2-14x=x(12x-14)