Aidez moi s'il vous plait !

On donne D= (2x +7)² - (2x+7) (3x-1)

1- Développer e réduire D (attention au moins !)
2- Factoriser D
3-Calculer D pour x= - 2
4- Résoudre (2x +7)(-x+8) =0

Merci !!
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