x*x-x/2=81

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Solution for x*x-x/2=81 equation: 


x in (-oo:+oo)

x*x-(x/2) = 81 // - 81

x*x-(x/2)-81 = 0

x^2-1/2*x-81 = 0

DELTA = (-1/2)^2-(-81*1*4)

DELTA = 1297/4

DELTA > 0

x = ((1297/4)^(1/2)+1/2)/(1*2) or x = (1/2-(1297/4)^(1/2))/(1*2)

x = ((1297/4)^(1/2)+1/2)/2 or x = (1/2-(1297/4)^(1/2))/2

x in { (1/2-(1297/4)^(1/2))/2, ((1297/4)^(1/2)+1/2)/2 }

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