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x in (-oo:+oo)
10*x^2-((2/8)*x) = 0
10*x^2+(-1/4)*x = 0
10*x^2-1/4*x = 0
DELTA = (-1/4)^2-(0*4*10)
DELTA = 1/16
DELTA > 0
x = ((1/16)^(1/2)+1/4)/(2*10) or x = (1/4-(1/16)^(1/2))/(2*10)
x = 1/40 or x = 0
x in { 0, 1/40 }
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