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Yoshino
@Yoshino
April 2019
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Bonsoir je dois résoudre une équation. x²+5x= 0; X²+4= 0;4x²+12x= - 9
Merci d'avance
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Bonjour,
x² + 5x = 0
x(x + 5) = 0
x = 0 ou x + 5 = 0
x = 0 ou x = - 5
x² + 4 = 0
x
² = - 4
Ce n'est pas possible.
4x² + 12x = - 9
4x
² + 12x + 9 = 0
(2x + 3)² = 0
2x + 3 = 0
2x = -3
x = -3/2
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x² + 5x = 0
x(x + 5) = 0
x = 0 ou x + 5 = 0
x = 0 ou x = - 5
x² + 4 = 0
x² = - 4
Ce n'est pas possible.
4x² + 12x = - 9
4x² + 12x + 9 = 0
(2x + 3)² = 0
2x + 3 = 0
2x = -3
x = -3/2