21=x^2-x/2

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Solution for 21=x^2-x/2 equation: 


x in (-oo:+oo)

21 = x^2-(x/2) // - x^2-(x/2)

x/2-x^2+21 = 0

1/2*x-x^2+21 = 0

DELTA = (1/2)^2-(-1*4*21)

DELTA = 337/4

DELTA > 0

x = ((337/4)^(1/2)-1/2)/(-1*2) or x = (-(337/4)^(1/2)-1/2)/(-1*2)

x = ((337/4)^(1/2)-1/2)/(-2) or x = ((337/4)^(1/2)+1/2)/2

x in { ((337/4)^(1/2)-1/2)/(-2), ((337/4)^(1/2)+1/2)/2 }

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