Réponses

2013-04-21T14:46:45+02:00
E(x) = (-4x-3) [(2x-1)+(-x-1)]
E(x) = (-4x-3) (2x-1-x-1)
E(x) = (-4x-3) (x-2)

Pour x = 4
E = (-4x-3) (x-2)
E = (-16-3)(4-2)
E = -19x2
E = -38