x²-81 =(x-9)(x+9) identite remarquable de la forme a²-b² =(a-b)(a+b)
9t²-16 = (3t-4)(3t+4) idem
x²+2x+1 =(x+1)² identite a²+2ab+v² =(a+b)²
x²-6x+9 =(x-3)² indentite a²-2ab+b =(a-b)²
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x²-81 =(x-9)(x+9) identite remarquable de la forme a²-b² =(a-b)(a+b)
9t²-16 = (3t-4)(3t+4) idem
x²+2x+1 =(x+1)² identite a²+2ab+v² =(a+b)²
x²-6x+9 =(x-3)² indentite a²-2ab+b =(a-b)²
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Salut :)J'espère t'avoir aidé(e) ! :)