3(4x*x+4x+1)+20x+10+3=0 12x*x+12x+3+20x+10+3=0 12x*x+32x+16=0 3x*x+8x+4=0 D=64-4*3*4=64-48=16 x1=(-8+4)/6=-4/6=-2/3 x2=(-8-4)/6=-12/6=-2 Ответ: -2, -2/3