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2x² – 2x – 4 = 0 a = b = c = 2 – 2 – 4 Calcul du discriminant :  = 36  > 0, donc l’équation admet deux solutions x 1 = – 1 x 2 = 2.

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Presentation on theme: "2x² – 2x – 4 = 0 a = b = c = 2 – 2 – 4 Calcul du discriminant :  = 36  > 0, donc l’équation admet deux solutions x 1 = – 1 x 2 = 2."— Presentation transcript:

1 2x² – 2x – 4 = 0 a = b = c = 2 – 2 – 4 Calcul du discriminant :  = 36  > 0, donc l’équation admet deux solutions x 1 = – 1 x 2 = 2

2 x² + 4x + 3 = 0 a = b = c = Calcul du discriminant :  = 4  > 0, donc l’équation admet deux solutions x 1 = – 3 x 2 = – 1

3 6x² + 6x – 12 = 0 a = b = c = 6 –12 Calcul du discriminant :  = 324  > 0, donc l’équation admet deux solutions x 1 = – 2 x 2 = 1

4 x² + 8x + 16 = 0 a = b = c = Calcul du discriminant :  = 0  = 0, donc l’équation admet une solution x = – 4

5 x² – 6x + 7 = –2 a = b = c = 1 – 6 9 Calcul du discriminant :  = 0  = 0, donc l’équation admet une solution x = 3 x² – 6x + 9 = 0 différent de zéro !!!

6 – 2x² +3x – 4 = 0 a = b = c = – 2 3 – 4 Calcul du discriminant :  = – 23  < 0, donc l’équation n’admet pas de solution

7 4x² – x + 1 = 0 a = b = c = 4 – 1 1 Calcul du discriminant :  = – 15  < 0, donc l’équation n’admet pas de solution


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