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x in (-oo:+oo)
y = (1/4)*(x-2)^2-4 // - (1/4)*(x-2)^2-4
y-((1/4)*(x-2)^2)+4 = 0
(-1/4)*(x-2)^2+y+4 = 0
y-1/4*(x-2)^2+4 = 0
y-1/4*(x-2)^2+4 = 0
x-1/4*x^2+y-1+4 = 0
x-1/4*x^2+y+3 = 0
x-1/4*x^2+y+3 = 0
x-1/4*x^2+y+3 = 0
DELTA = 1^2-(-1/4*4*(y+3))
DELTA = y+4
y+4 = 0
y+4 = 0 // - 4
y = -4
DELTA = 0 <=> t_3 = -4
x = -1/(-1/4*2) i y = -4
x = 2 i y = -4
( x = ((y+4)^(1/2)-1)/(-1/4*2) or x = (-(y+4)^(1/2)-1)/(-1/4*2) ) i y > -4
( x = -2*((y+4)^(1/2)-1) or x = 2*((y+4)^(1/2)+1) ) i y > -4
y+4 > 0
y+4 > 0 // - 4
y > -4
x in { 2, -2*((y+4)^(1/2)-1), 2*((y+4)^(1/2)+1) }
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