9x^2+12x+4=0 x^2+6x+10=0
(3x+2)^2=0 9x^2+12x+4=0 (3x+2)^2=0 3x+2=0 x=-2 --- 3
9x^2+12x+2=0 a=9 b=12 c=2 D=b^2-4ac D=144-4*9*2=144-72=72>0 2k X1:2=(-b+-√D)/2a X1:2=(-12+-8.48)/18 X1=-0.2 X2=-1.14 x^2+6x+10=0 x(x+6)=-10 x=-10 или x+6=-10 x=-16