(x^2/2)-x=12

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Solution for (x^2/2)-x=12 equation: 


x in (-oo:+oo)

(x^2)/2-x = 12 // - 12

(x^2)/2-x-12 = 0

1/2*x^2-x-12 = 0

DELTA = (-1)^2-(-12*1/2*4)

DELTA = 25

DELTA > 0

x = (25^(1/2)+1)/(1/2*2) or x = (1-25^(1/2))/(1/2*2)

x = 6 or x = -4

x in { -4, 6 }

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