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sirinemarseille
@sirinemarseille
June 2021
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bonsoir ! Comment développer 9-(x+2)² ?
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lulux3
Tu dois d'abord développer l'expression entre parenthèse puis après la suite !
9-(2x)²
= 9 - 4x²
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CansuCeline
9 - (x+2)^2 = 9 - (x+2) (x+2) = 9 - x^2 + 2x + 2x + 4 = x^2 + 4x + 5 voila :)
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sirinemarseille
il y'a un moins devant le x² (a ta derniere phrase) je crois
CansuCeline
oui il y a un moin je l'ai oublié
sirinemarseille
ah je me disais aussi ^^ merci
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9-(2x)²
= 9 - 4x²