Réponses

  • Utilisateur Brainly
2014-10-11T18:59:03+02:00
- x² - 2x + 3 = 1/2x - 1
- x² - 2x - 1/2x + 3 + 1 = 0
- x² - 5/2x + 4 = 0
x² + 5/2x - 4 = 0
2x² + 5x - 8 = 0

Δ = b² - 4ac
Δ = 5² - 4 x 2 x (- 8)
Δ = 25 + 64
Δ = 89

x₁ = (- 5 - √89) / 4

x₂ = (- 5 + √89) / 4