x(x+1)+(x-2)(x+2)-2x<0 x²+x+x²-4-2x<0 2x²-x-4<0 pozdrawiam ;pp
x(x+1)+(x-2)(x+2)-2x<0 x²+x+x²+2x-2x-4<0 2x²+x-4<0