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Elofcn
@Elofcn
April 2019
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(x+7)²=144
x²+2*7*x+7²=144
x²+14x+49=144
x²+14x=95
Je suis parvenu jusqu'ici mais après je suis bloquée aidez-moi svp!
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Commentaires (1)
(x+7)²=144
(x+7)²=12²
x+7=12 ou x+7=-12
x=5 ou x=-19
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(x+7)²=12²
x+7=12 ou x+7=-12
x=5 ou x=-19