II I I 28 2012SCHOOL NEWS

? ? (Descriminant) . ax2+ bx+c = 0. b2-4ac

.1. b2-4ac =0 , ,. x2+4x+4 =0 (-2, -2). (x+2)2=x2 +4x+4 . b2-4ac =16-16 =0 .2. b2-4ac > 0 . x2+6x+8 = 0 (-2, -4) . (x+2)(x+4)=0 . b2-4ac = 36-32 =4>0 . 3. b2-4ac