Exercice 2: On donne l'expression D = (2 - 5x) (4x + 3) + (2 - 5x)²
1. Développer, réduire et ordonner D
2. Factoriser D
3. Calculer D pour x = -1
4. Résoudre D = 0. Montrer que les solutions de D = 0 sont x = 0,4 et x = 5
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