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x in (-oo:+oo)
y = (2*x^2-(20*x))/25 // - (2*x^2-(20*x))/25
y-((2*x^2-(20*x))/25) = 0
y-((2*x^2-20*x)/25) = 0
(-1*(2*x^2-20*x))/25+y = 0
(-1*(2*x^2-20*x))/25+(25*y)/25 = 0
25*y-1*(2*x^2-20*x) = 0
20*x-2*x^2+25*y = 0
(20*x-2*x^2+25*y)/25 = 0
(20*x-2*x^2+25*y)/25 = 0 // * 25
20*x-2*x^2+25*y = 0
20*x-2*x^2+25*y = 0
DELTA = 20^2-(-2*4*25*y)
DELTA = 200*y+400
200*y+400 = 0
200*y+400 = 0 // - 400
200*y = -400 // : 200
y = -400/200
y = -2
DELTA = 0 <=> t_3 = -2
x = -20/(-2*2) i y = -2
x = 5 i y = -2
( x = ((200*y+400)^(1/2)-20)/(-2*2) or x = (-(200*y+400)^(1/2)-20)/(-2*2) ) i y > -2
( x = ((200*y+400)^(1/2)-20)/(-4) or x = ((200*y+400)^(1/2)+20)/4 ) i y > -2
y+2 > 0
y+2 > 0 // - 2
y > -2
x in { 5, ((200*y+400)^(1/2)-20)/(-4), ((200*y+400)^(1/2)+20)/4 }
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