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Sagot :

Bonjour,

4x² - 15x + 5 = 5x - 20

4x² - 15x - 5x + 5 + 20 = 0

4x² - 20x + 25 = 0

∆ = b² - 4ac = (-20)² - 4 × 4 × 25 = 0

Une solution : -b/2a = -(-15)/(2×4) = 15/8

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