Réponses

2013-05-24T21:54:39+02:00

Bonsoir

 

D = (x-2)(x-2)-2

D = (x-2)(x-2-2)

D = (x-2)(x-4)

 

D = (x²-4x+4) -(2x-4)

D = x²-4x-4-2x+4

D = x² -6x

2013-05-24T21:55:15+02:00

Factoriser:

 

D = (x-2)^2-2(x-2) \\D = (x-2)(x-2)-2(x-2) \\D=(x-2)(x-2-2) \\D=(x-2)(x-4)

 

Developper et réduire:

 

D = (x-2)(x-4) \\D=x^2-4x-2x+8 \\D=x^2-6x+8