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Ca1303
@Ca1303
April 2019
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On considère l'expression D = (2x - 3 )² - 16.
1) Développe et réduis D.
2) Factorise D.
3) Calcule D pour x = - 3 puis pour x = √5.
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geekkhalil
Salut :)
On considère l'expression D = (2x - 3 )² - 16.
1) Développe et réduis D.
D = (2x - 3 )² - 16
D = 4 x²-12 x-7
2) Factorise D.
D = (2x - 3 )² - 16
D =
(2 x-7) (2 x+1)
3) Calcule D pour x = - 3 puis pour x = √5.
D = 4 x²-12 x-7 si x = -3
alors
D = 4×(-3)²-12×(-3)-7
D = 65
D = 4 x²-12 x-7 si x = √5
alors
D = 4√5-12√5-7
D = -7-8√5
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ca1303
Pourrais tu me donner avec le raisonnement complet car je ne comprend pas comment tu as fait merci
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On considère l'expression D = (2x - 3 )² - 16.
1) Développe et réduis D.
D = (2x - 3 )² - 16
D = 4 x²-12 x-7
2) Factorise D.
D = (2x - 3 )² - 16
D = (2 x-7) (2 x+1)
3) Calcule D pour x = - 3 puis pour x = √5.
D = 4 x²-12 x-7 si x = -3
alors
D = 4×(-3)²-12×(-3)-7
D = 65
D = 4 x²-12 x-7 si x = √5
alors
D = 4√5-12√5-7
D = -7-8√5