factoriser (3x+5)^{2}-(5x-7)^{2}
Mathématiques
sdhaifallah
Question
factoriser
(3x+5)^{2}-(5x-7)^{2}
(3x+5)^{2}-(5x-7)^{2}
1 Réponse
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1. Réponse fridabd
la forme a²-b²=(a-b)(a+b)
[(3x+5)-(5x-7)][(3x+5)+(5x-7)]=(3x+5-5x+7)(3x+5+5x-7)
=(-2x+12)(8x-2)