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Sagot :

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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