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Sagot :

Bonsoir,

• x⁴-5x²+4 = 0

• t²-5t+4 = 0

• t = 1 ; t = 4

• x² = 1 ; x² = 4

• x = 1 ; x = -1 ; x² = 4

• x = 1 ; x = -1 ; x = 2 ; x = -2

↳ Équation à 4 solutions : x1 = 1 ; x2 = -1 ; x3 = 2 ; x4 = -2

Bonne soirée.

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