Hi Sqrt(2x-x^2)=(x-1)^2 (2x-x^2) = (x-1)^4 | 2x-x^2 = x^4 + 4x^3*-1 + 6x^2*1 + 4x*-1 + 1 2x-x^2 = x^4 - 4x^3 + 6x^2 - 4x + 1 x^4 - 4x^3 + 7x^2 -6x + 1 = 0