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Sagot :

SKABETIX

Bonjour,

-3x² + 120x - 900 = 0

∆ = b² - 4ac = 120² - 4 ×(- 3) × (-900) = 3600

x1 = (-b + √∆)/2a = (-120 + 60)/(-6) = (-60)/(-6) = 10

x2 = (-b - √∆)/2a = (-120 - 60)/(-6) = (-180)/(-6) = 30

S = {10 ; 30}

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