9x^2-6x+1=0 5x^2-8x-4=0 решите через дискриминант пLиZZZZ
1) D= 36-36=0 x(1,2)= (6+0)/18= 1/3 2) D= 64+80=144 x(1)= (8+12)/10=2 x(2)= (8-12)/10= -0,2
D=36-4*9*1 D=0 x1/2=6/18 x1/2=1/3 2) D=64-4*5*(-4) D=144=12^2 x1=8+12/10=2 x2=8-12/10=-2/5