Réponses

2013-10-16T18:05:51+02:00
X=2 -> 2(2-4)=2*(-2)=-4
x=3 -> 3(3-4)=-3
x=4 -> 4(4-4)=0
x=5 -> 5(5-4)=5
x=6 -> 6(6-4)=12

Faut juste remplacer x par les valeurs :)
2013-10-16T18:14:32+02:00
2 ( 2 - 4 ) = 2 * 2 + 2 * (-4) = 4 - 8 = -4

3 ( 3 - 4 ) = 3 * 3 + 3 * (-4) = 9 - 12 = -3

4 ( 4 - 4 ) = 4 * 4 + 4 * (-4) = 16 - 16 = 0

5 ( 5 - 4  = 5 * 5 + 5 * (-4) = 20 - 16 = 4

6 ( 6 - 4 ) = 6 * 6 + 6 * (-4) = 36 - 24 = 12