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Sagot :

ECTO220

Réponse :

Bonjour

9x² - 100 = 0

⇔ (3x)² - 10² = 0

⇔ (3x + 10)(3x - 10) = 0

⇔ 3x + 10 = 0 ou 3x - 10 = 0

⇔ 3x = -10 ou 3x = 10

⇔ x = -10/3 ou x = 10/3

S = {-10/3 ; 10/3}

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