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Yuuka
@Yuuka
May 2019
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Je vous en prie aidez moi !
svp aidez moi la reponse de l'equation suivante avec la methode si possible pour que je comprene.
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Bonjour,
3x(x-3) - 2x²-18
3x(x-3) = 2(x²-9)
3x(x-3)-2(x²-9) = 0
à noter x²-9 =a²-b² =(x-3)(x+3)
3x(x-3)-2(x-3)(x+3) = 0
on facto :
(x-3)[3x-2(x+3)] = 0
(x-3)(3x-2x-6) =0
(x-3)(x-6) = 0
on résous :
x-3 =0
x = 3
x-6 =0
x = 6
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Je vous en prie aidez moi! svp aidez moi la reponse de l'equation suivante avec la methode si possible pour que je comprene. 3x (x-3) = 2 x^{2} -18
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Verified answer
Bonjour,3x(x-3) - 2x²-18
3x(x-3) = 2(x²-9)
3x(x-3)-2(x²-9) = 0
à noter x²-9 =a²-b² =(x-3)(x+3)
3x(x-3)-2(x-3)(x+3) = 0
on facto :
(x-3)[3x-2(x+3)] = 0
(x-3)(3x-2x-6) =0
(x-3)(x-6) = 0
on résous :
x-3 =0
x = 3
x-6 =0
x = 6