Réponses

2014-03-09T19:54:24+01:00
B= 4x² + 8x + 4 = (2x)²+2*(2x)*2+2² = (2x+2)²

vérification : x=5
B= 4*5² + 8*5 + 4 = (2*5)²+2*(2*5)*2+2² =144
B= (2*5+2)²=144