x^2-2/5x

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Solution for x^2-2/5x equation: 


x in (-oo:+oo)

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

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

x^2-2/5*x = 0

DELTA = (-2/5)^2-(0*1*4)

DELTA = 4/25

DELTA > 0

x = ((4/25)^(1/2)+2/5)/(1*2) or x = (2/5-(4/25)^(1/2))/(1*2)

x = 2/5 or x = 0

x in { 0, 2/5 }

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