Verified answer

а) x(x-2)(x+1)=x²(x-1)

x(x²+x-2x-2)=x³-x²

x³+x²-2x²-2x-x³+x²=0

-2x=0

x=0

б) (2y-1)²-4(y-2)(y+2)= -5y+18

4y²-4y+1-4(y²-4)+5y-18=0

4y²-4y+1-4y²+16+5y-18=0

y-1=0

y=1