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Factoriser x²-4x-5
pleaaase aidez moi ... donnez une réponse claire svp ... :)
Factoriser x²-4x-5
pleaaase aidez moi ... donnez une réponse claire svp ... :)
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Factoriser x²-4x-5x² - 4x + 5
= (x + 1) (x - 5)
(x-2)²-9 = a²-b² qu'on facto (a-b)(a+b)
(x-2-3)(x-2+3) =
(x-5)(x+1)