Réponses

2012-10-01T19:11:50+02:00

1)  (2x-3) - (2x-3)(x+1) =  2x-3 - 2x² + 2x - 3x - 3 = 2x²+ 1x - 6

2)  (2x-3) - (2x-3)(x+1) = ?

2012-10-01T21:05:55+02:00

E(x)= (2x-3) - (2x-3)(x+1)

= 2x - 3  -[ 2x² + 2x - 3x - 3]

= 2x - 3  - 2x² - 2x + 3x + 3

= - 2x² + 3x

 

E(x)= (2x-3) - (2x-3)(x+1)

= - 2x² + 3x

= x(-2x + 3)

 

en espérant t'avoir aidé.