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x in (-oo:+oo)
y = ((5*x-(4*x^2))^1)/5 // - ((5*x-(4*x^2))^1)/5
y-(((5*x-(4*x^2))^1)/5) = 0
y-((5*x-4*x^2)/5) = 0
(-1*(5*x-4*x^2))/5+y = 0
(-1*(5*x-4*x^2))/5+(5*y)/5 = 0
5*y-1*(5*x-4*x^2) = 0
4*x^2-5*x+5*y = 0
(4*x^2-5*x+5*y)/5 = 0
(4*x^2-5*x+5*y)/5 = 0 // * 5
4*x^2-5*x+5*y = 0
4*x^2-5*x+5*y = 0
DELTA = (-5)^2-(4*4*5*y)
DELTA = 25-80*y
25-80*y = 0
25-80*y = 0 // - 25
-80*y = -25 // : -80
y = -25/(-80)
y = 5/16
DELTA = 0 <=> t_3 = 5/16
x = 5/(2*4) i y = 5/16
x = 5/8 i y = 5/16
( x = ((25-80*y)^(1/2)+5)/(2*4) or x = (5-(25-80*y)^(1/2))/(2*4) ) i y > 5/16
( x = ((25-80*y)^(1/2)+5)/8 or x = (5-(25-80*y)^(1/2))/8 ) i y > 5/16
y-5/16 > 0
y-5/16 > 0 // + 5/16
y > 5/16
x in { 5/8, ((25-80*y)^(1/2)+5)/8, (5-(25-80*y)^(1/2))/8 }
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