Réponse:
W2= 5
W3= -2
W4= 12
Explications:
Calculs:
Wn+1= -2*Wn+8
W2= -2*W1+8= -2*3/2+8
W3= -2*W2+8= -2*5+8
W4= -2*W3+8= -2*-2+8
