Bonjour j'ai besoin que quelqu'un vérifie l'exercice que j'ai terminé. Merci beaucoup !

D =  (2x +3 )^{2} +(2x+3)(7x - 2)

Développer et réduire D

D = (2x +3 )^{2} +(2x+3)(7x - 2)\\D = [(2x)^{2}+2*(2x+3)+3^{2}] + 2x*(-2)+2x*7+3*(-2)+3*7x\\D = [(2x)^{2}+2*(2x+3)+3^{2}] + 2x*(-2+7)+3*(-2+7)\\D = [(2x)^{2}+2*(2x+3)+3^{2}] + 2x*5+3*5\\D = [(2x)^{2}+2*(2x+3)+3^{2}] + 10x + 15

Factoriser D

D=(2x +3 )^{2} +(2x+3)(7x - 2)\\D = (2x+3)[(2x+3)+(7x-2)]

Calculer D pour x = -4

D = (2*-4+3)[(2*-4+3)+(7*(-4)-2)]\\D = -5 [-5 + (-30)]\\D = 175

Merci d'avance.
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