x2-2/5x-1/5=0

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Solution for x2-2/5x-1/5=0 equation: 


x in (-oo:+oo)

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

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

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

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

DELTA = 24/25

DELTA > 0

x = ((24/25)^(1/2)+2/5)/(1*2) or x = (2/5-(24/25)^(1/2))/(1*2)

x = ((24/25)^(1/2)+2/5)/2 or x = (2/5-(24/25)^(1/2))/2

x in { (2/5-(24/25)^(1/2))/2, ((24/25)^(1/2)+2/5)/2 }

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