Utilisons la formule quadratique : x = [-41 ± â(41² - 4Ã9Ã49)] / (2Ã9)
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- âx = 3x + 7
- Ãlevons au carré : x = (3x + 7)² = 9x² + 42x + 49
- = 9x² + 41x + 49
- Discriminant = 1681 - 1764 = -83 â Pas de solution réelle
- Mais vérifier : âx = 3x + 7 â test : supposons x = -4 â â(-4) non réel â aucune solution réelle
- Réévaluation : peut-être erreur, mais en résolvant algébriquement, aucune solution réelle car discriminant négatif.
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