(x^2+x)/2-2000=0

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Solution for (x^2+x)/2-2000=0 equation: 


x in (-oo:+oo)

(x^2+x)/2-2000 = 0

(x^2+x)/2+(-2000*2)/2 = 0

x^2+x-2000*2 = 0

x^2+x-4000 = 0

x^2+x-4000 = 0

x^2+x-4000 = 0

DELTA = 1^2-(-4000*1*4)

DELTA = 16001

DELTA > 0

x = (16001^(1/2)-1)/(1*2) or x = (-16001^(1/2)-1)/(1*2)

x = (16001^(1/2)-1)/2 or x = (-(16001^(1/2)+1))/2

(x+(16001^(1/2)+1)/2)*(x-((16001^(1/2)-1)/2)) = 0

((x+(16001^(1/2)+1)/2)*(x-((16001^(1/2)-1)/2)))/2 = 0

((x+(16001^(1/2)+1)/2)*(x-((16001^(1/2)-1)/2)))/2 = 0 // * 2

(x+(16001^(1/2)+1)/2)*(x-((16001^(1/2)-1)/2)) = 0

( x+(16001^(1/2)+1)/2 )

x+(16001^(1/2)+1)/2 = 0 // - (16001^(1/2)+1)/2

x = -((16001^(1/2)+1)/2)

( x-((16001^(1/2)-1)/2) )

x-((16001^(1/2)-1)/2) = 0 // + (16001^(1/2)-1)/2

x = (16001^(1/2)-1)/2

x in { -((16001^(1/2)+1)/2), (16001^(1/2)-1)/2 }

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