-2x(х-4)=0-2x^2+8x=0x(-2x+8)=0x=0 -2x=-8 x=4у(у+3)(у-6)=0y(y^2-6y+3y-18)=0y^3-6y^2-3y-18y=0y(y^2-3y-18)=0y=0 y^2-3y-18=0 D=9+72=81 y1=(3+9)\2=6 y2=(3-9)\2=-3z(2-z)(3-2z)=0z(6-4z-3z+2z^2)=06z-7z^2+2z^3=0z(6-7z+2z^2)=0z=0 2z^2-7z+6=0 D=49-48=1 z1=(7+1)\4=2 z2=(7-1)\4=3\2Зх2+15х=0x(3x+15)=0x=0 3x=-15 x=-59у-у2=0y(9-y)=0y=0 y=9-2х2-4х=0-2x(x+2)=0x=0 x=-2x^3-x^2=0x^2(x-1)=0x=0 x=1