Решите уравнение

-2x^2-4x=0

x^3-x^2=0

1-z^2=0

3z^2-75=0

5z^3-5z=0

z-9z^3=0

5y^2+20y+20=0

2y^2-12y+18=0

-2x^2-4x=0

-2 х (х+2) = 0

-2 х=0 х+2=0

х=0 х=-2

x^3-x^2=0

х^2 (х-1) = 0

х^2=0 х-1=0

х=0 х=1

1-z^2=0

1=z^2

z=+-1

3z^2-75=0

3z^2=75

z^2=25

z=+-5

5z^3-5z=0

5z (z^2-1) = 0

5z=0 z^2-1=0

z=0 z^2=1

z=+-1

z-9z^3=0

z (1-9z^2) = 0

z=0 1-9z^2=0

1=9z^2

z^2=1/9

z=+-1/3

5y^2+20y+20=0 | (:5)

y^2+4y+4=0

(y+2) ^2=0

y+2=0

y=-2

2y^2-12y+18=0 ] (:2)

y^2-6y+9=0

(y-3) ^2=0

y-3=0

y=3