Réponse:
(2x-1)(x+3)-(2x-1)^2=
(2x-1)[(x+3)-(2x-1)]=
(2x-1)(x+3-2x+1)=
(2x+1)(-x+4)=
-2x^2+8x-x+4=
-2x^2+7x+4
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Réponse:
(2x-1)(x+3)-(2x-1)^2=
(2x-1)[(x+3)-(2x-1)]=
(2x-1)(x+3-2x+1)=
(2x+1)(-x+4)=
-2x^2+8x-x+4=
-2x^2+7x+4