в) 3х^2-х+1=0
D = (-1) - 4*3*1 = 1 - 12 = -11
D<0 - корней нет
г)9х^2+24х+16=0
D = 24^2 - 4*9*16 = 576 - 576 = 0
D = 0 - 1 корень
x = -b/2 = -24/2 = -12
в) 3х^2-х+1=0
D = (-1) - 4*3*1 = 1 - 12 = -11
D<0 - корней нет
г)9х^2+24х+16=0
D = 24^2 - 4*9*16 = 576 - 576 = 0
D = 0 - 1 корень
x = -b/2 = -24/2 = -12