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x in (-oo:+oo)
y = (1/4)*(x-5)^2+4 // - (1/4)*(x-5)^2+4
y-((1/4)*(x-5)^2)-4 = 0
(-1/4)*(x-5)^2+y-4 = 0
y-1/4*(x-5)^2-4 = 0
y-1/4*(x-5)^2-4 = 0
5/2*x-1/4*x^2+y-25/4-4 = 0
5/2*x-1/4*x^2+y-41/4 = 0
5/2*x-1/4*x^2+y-41/4 = 0
5/2*x-1/4*x^2+y-41/4 = 0
DELTA = (5/2)^2-(-1/4*4*(y-41/4))
DELTA = y-4
y-4 = 0
y-4 = 0 // + 4
y = 4
DELTA = 0 <=> t_3 = 4
x = -5/2/(-1/4*2) i y = 4
x = 5 i y = 4
( x = ((y-4)^(1/2)-5/2)/(-1/4*2) or x = (-(y-4)^(1/2)-5/2)/(-1/4*2) ) i y > 4
( x = -2*((y-4)^(1/2)-5/2) or x = 2*((y-4)^(1/2)+5/2) ) i y > 4
y-4 > 0
y-4 > 0 // + 4
y > 4
x in { 5, -2*((y-4)^(1/2)-5/2), 2*((y-4)^(1/2)+5/2) }
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