x=1/10x^2+2/5

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Solution for x=1/10x^2+2/5 equation: 


x in (-oo:+oo)

x = (1/10)*x^2+2/5 // - (1/10)*x^2+2/5

x-((1/10)*x^2)-(2/5) = 0

(-1/10)*x^2+x-2/5 = 0

x-1/10*x^2-2/5 = 0

DELTA = 1^2-(-2/5*(-1/10)*4)

DELTA = 21/25

DELTA > 0

x = ((21/25)^(1/2)-1)/(-1/10*2) or x = (-(21/25)^(1/2)-1)/(-1/10*2)

x = -5*((21/25)^(1/2)-1) or x = 5*((21/25)^(1/2)+1)

x in { -5*((21/25)^(1/2)-1), 5*((21/25)^(1/2)+1) }

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