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x in (-oo:+oo)
x-x^2 = 1/4 // - 1/4
x-x^2-(1/4) = 0
x-x^2-1/4 = 0
x-x^2-1/4 = 0
DELTA = 1^2-(-1*(-1/4)*4)
DELTA = 0
x = -1/(-1*2)
x = 1/2 or x = 1/2
x in { 1/2, 1/2 }
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