Bsr
Identité remarquable : a²-b²=(a-b)(a+b)
= (3x+15)²-36
= (3x+15-6)(3x+15+6)
= (3x+9)(3x+15+6)
= (3x+9)(3x+21)
= 3(x+3)(3x+21)
= 3(x+3)3(x+7)
= 3×3(x+3)(x+7)
= 9(x+3)(x+7)
Voilà !
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Bsr
Identité remarquable : a²-b²=(a-b)(a+b)
= (3x+15)²-36
= (3x+15-6)(3x+15+6)
= (3x+9)(3x+15+6)
= (3x+9)(3x+21)
= 3(x+3)(3x+21)
= 3(x+3)3(x+7)
= 3×3(x+3)(x+7)
= 9(x+3)(x+7)
Voilà !