resoudre equation - 5x au carre= -80​

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Grade: Education Subject: mathematiques
resoudre equation - 5x au carre= -80​
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et bien déjà.. BONJOUR...

ensuite

-5x² = -80

donc 5x² = 80

soit x² = 16

x² - 16 = 0

x² - 4² = 0

(x+4) (x-4) = 0

2 solutions -4 et 4