-x2-2/5x=1

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Solution for -x2-2/5x=1 equation: 


x in (-oo:+oo)

(-x)^2-((2/5)*x) = 1 // - 1

(-x)^2-((2/5)*x)-1 = 0

(-x)^2+(-2/5)*x-1 = 0

x^2-2/5*x-1 = 0

DELTA = (-2/5)^2-(-1*1*4)

DELTA = 104/25

DELTA > 0

x = ((104/25)^(1/2)+2/5)/(1*2) or x = (2/5-(104/25)^(1/2))/(1*2)

x = ((104/25)^(1/2)+2/5)/2 or x = (2/5-(104/25)^(1/2))/2

x in { (2/5-(104/25)^(1/2))/2, ((104/25)^(1/2)+2/5)/2 }

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