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x in (-oo:+oo)
y = 25-(((x-8)^2)/4) // - 25-(((x-8)^2)/4)
((x-8)^2)/4+y-25 = 0
((x-8)^2)/4+(4*y)/4+(-25*4)/4 = 0
(x-8)^2+4*y-25*4 = 0
x^2-16*x+4*y-100+64 = 0
x^2-16*x+4*y-36 = 0
(x^2-16*x+4*y-36)/4 = 0
(x^2-16*x+4*y-36)/4 = 0 // * 4
x^2-16*x+4*y-36 = 0
x^2-16*x+4*y-36 = 0
DELTA = (-16)^2-(1*4*(4*y-36))
DELTA = 256-4*(4*y-36)
256-4*(4*y-36) = 0
256-4*(4*y-36) = 0
400-16*y = 0
400-16*y = 0
400-16*y = 0 // - 400
-16*y = -400 // : -16
y = -400/(-16)
y = 25
DELTA = 0 <=> t_3 = 25
x = 16/(1*2) i y = 25
x = 8 i y = 25
( x = ((256-4*(4*y-36))^(1/2)+16)/(1*2) or x = (16-(256-4*(4*y-36))^(1/2))/(1*2) ) i y > 25
( x = ((256-4*(4*y-36))^(1/2)+16)/2 or x = (16-(256-4*(4*y-36))^(1/2))/2 ) i y > 25
y-25 > 0
y-25 > 0 // + 25
y > 25
x in { 8, ((256-4*(4*y-36))^(1/2)+16)/2, (16-(256-4*(4*y-36))^(1/2))/2 }
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