1.х²-100х=х(х-100)=0 , x[1]=0, x[2]=100/
5.x^4-
х²=х²(х²-1)=x(x-1)(x+1)=0, x[1]=-1,x[2]=0,x[3]=1
3.9/25x^3-x=x(9/25
х²-1)=x(3/5-x)(x+3/5)=0,
x[1]=-3/5,x[2]=0,x[3]=3/5
4.25y²+20y+4=(5y+2)²=0,5y=-2, y=-2/5,y=-0/4.
5.36x²-60x+25=0,(6x-5)²=0,6x=5,x=5/6.
6.x^5-49x^3=x^3(
х²-49)=
x^3(x-7)(x+7)=0,
x[1]=-7,x[2]=0,x[3]=7.
7.x^3+2x²-9x- 18 =
x^3-9x +2x²-18=x(
x²-9) +2(
x²-9)=
=(x+2)(x-3)(x+3)=0
x[1]=-2,x[2]=-3,x[3]=3
8.y^3-y²-4y+= (y^3-y²)-(4y-4)=
y²(y-1)-4(y-1)=(y-1)(
y²-4)=
=(y-1)(y-2)(y+2)=0
y[1]=-2,y[2]=1,y[3]=2.