Réponses

2014-02-23T23:24:46+01:00

Distribuer :

A= (x+1)²-(2x-3)(5x+7)

A= x²+2x +1 - 10x² -14x +15x +21

A = - 9 x² +3 x +22


B=(3x+1)(4x-9)+  ( 2x-3)²

B = 12 x² - 27x + 4x -9 + 4x² - 12 x +9

B = 16 x² -35 x


C=(6x-1)(6x+1)

C = 36x² + 6x - 6x -1

C = 36 x² - 1