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Sagot :

B : 4xau carré + 4x + 1+ 2x au carré-4x+x-2 = 6x au carré +1

 

je crois que c'est ça

B= (2x+1)²+(2x+1)(x-2)

= 2x² + 2*2x*1 +1² + (2x *x +2x * -2 + 1*x +1 *-2)

= 4x² + 4x +1 + 2x² -4x +x -2

= 6x² -1

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