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Sagot :

Bonjour,

x² - 4x(x - 3) = 0

x² - 4x² + 12x = 0

-3x² + 12x = 0

-3x(x - 4) = 0 ← factorisation par -3x

-3x = 0 ou x - 4 = 0

x = 0 ou x = 4

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