April 2019 2 67 Report
E = - 5 (- 3x + 5)² + (9x - 15)
E = - 5 (9x² - 30x + 25) + 9x - 15
E = - 45x² + 150x - 125 + 9x - 15
E = - 45x² + 159x - 140

Aidez moi, je ne sais pas d'ou viens le 30x de la deuxième ligne
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