x-x*x/5=0.2

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Solution for x-x*x/5=0.2 equation: 


x in (-oo:+oo)

x-((x*x)/5) = 0.2 // - 0.2

x-((x*x)/5)-0.2 = 0

(-1/5)*x^2+x-0.2 = 0

x-1/5*x^2-0.2 = 0

DELTA = 1^2-(-1/5*(-0.2)*4)

DELTA = 0.84

DELTA > 0

x = (0.84^(1/2)-1)/(-1/5*2) or x = (-0.84^(1/2)-1)/(-1/5*2)

x = -5/2*(0.84^(1/2)-1) or x = 5/2*(0.84^(1/2)+1)

x in { -5/2*(0.84^(1/2)-1), 5/2*(0.84^(1/2)+1) }

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