Réponses

2012-11-09T16:58:41+01:00

D = (8x²-6x-6) -((4x)²-2*3*4x+3²)

D=(8x²-6x-6) - (16x²-24x+9)

D= 8x²-6x-6 -16x²+24x-9

D= -8x²+18x-15

 

Enfin je crois..

Meilleure réponse !
2012-11-09T17:08:04+01:00

1-(4x-3)(2x-2)-(4x-3)²

=8x²-8x-6x+6-(8x²-24x+9)

=8x²-8x-8x²+24x-9

=-8x+24x-9

=16x-9

 

 

2- (4x-3)(2x-2)-(4x-3)²

=(4x-3)(4x-3)(2x-2)

=(4x-3)(8x²-8x-6x+6)

=(4x-3)(8x²-14x+6)

 

 

3-

x=3

16*3-9

=39

x=2

16*2-9

=23

x=4

16*4-9

=55