Ответы и объяснения

2014-03-27T12:12:57+04:00
(x+3)*(x+4)=0
x^2+4x+3x+12 = 0
x^2+7x+12= 0 
D = 49 - 48 =1 
x1=-7+1/2 = -6/2= -3
x2= -7-1 /2 = -8/2 = -4