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x in (-oo:+oo)
y = (1/5)*(x-3)^2-5 // - (1/5)*(x-3)^2-5
y-((1/5)*(x-3)^2)+5 = 0
(-1/5)*(x-3)^2+y+5 = 0
y-1/5*(x-3)^2+5 = 0
y-1/5*(x-3)^2+5 = 0
6/5*x-1/5*x^2+y-9/5+5 = 0
6/5*x-1/5*x^2+y+16/5 = 0
6/5*x-1/5*x^2+y+16/5 = 0
6/5*x-1/5*x^2+y+16/5 = 0
DELTA = (6/5)^2-(-1/5*4*(y+16/5))
DELTA = 4/5*(y+16/5)+36/25
4/5*(y+16/5)+36/25 = 0
(4/5*25*(y+16/5))/25+36/25 = 0
4/5*25*(y+16/5)+36 = 0
20*y+100 = 0
(20*y+100)/25 = 0
(20*y+100)/25 = 0 // * 25
20*y+100 = 0
20*y+100 = 0 // - 100
20*y = -100 // : 20
y = -100/20
y = -5
DELTA = 0 <=> t_3 = -5
x = -6/5/(-1/5*2) i y = -5
x = 3 i y = -5
( x = ((4/5*(y+16/5)+36/25)^(1/2)-6/5)/(-1/5*2) or x = (-(4/5*(y+16/5)+36/25)^(1/2)-6/5)/(-1/5*2) ) i y > -5
( x = -5/2*((4/5*(y+16/5)+36/25)^(1/2)-6/5) or x = 5/2*((4/5*(y+16/5)+36/25)^(1/2)+6/5) ) i y > -5
y+5 > 0
y+5 > 0 // - 5
y > -5
x in { 3, -5/2*((4/5*(y+16/5)+36/25)^(1/2)-6/5), 5/2*((4/5*(y+16/5)+36/25)^(1/2)+6/5) }
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