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Mumilou45
@Mumilou45
May 2019
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Bonsoir j’ai besoin d’aide pour l’exercice numéro un merci de bien vouloir m’aider
Exercice 1
X2=4+(x+2)(x-2) est-elle vraie pour tout nombre x? justifier la réponse
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isapaul
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Bonsoir,
(x+2)(x-2) est une identité remarquable de forme de (a+b)(a-b) = a² - b²
donc
4 + (x+2)(x-2) = 4 + x² - 2² = x²
Bonne soirée
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Verified answer
Bonsoir,(x+2)(x-2) est une identité remarquable de forme de (a+b)(a-b) = a² - b²
donc
4 + (x+2)(x-2) = 4 + x² - 2² = x²
Bonne soirée