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x in (-oo:+oo)
y = (-5/4)*(x+5)^2+4 // - (-5/4)*(x+5)^2+4
y-((-5/4)*(x+5)^2)-4 = 0
(5/4)*(x+5)^2+y-4 = 0
5/4*(x+5)^2+y-4 = 0
5/4*(x+5)^2+y-4 = 0
5/4*x^2+25/2*x+y-4+125/4 = 0
5/4*x^2+25/2*x+y+109/4 = 0
5/4*x^2+25/2*x+y+109/4 = 0
5/4*x^2+25/2*x+y+109/4 = 0
DELTA = (25/2)^2-(5/4*4*(y+109/4))
DELTA = 625/4-5*(y+109/4)
625/4-5*(y+109/4) = 0
(-5*4*(y+109/4))/4+625/4 = 0
625-5*4*(y+109/4) = 0
80-20*y = 0
(80-20*y)/4 = 0
(80-20*y)/4 = 0 // * 4
80-20*y = 0
80-20*y = 0 // - 80
-20*y = -80 // : -20
y = -80/(-20)
y = 4
DELTA = 0 <=> t_3 = 4
x = -25/2/(5/4*2) i y = 4
x = -5 i y = 4
( x = ((625/4-5*(y+109/4))^(1/2)-25/2)/(5/4*2) or x = (-(625/4-5*(y+109/4))^(1/2)-25/2)/(5/4*2) ) i y > 4
( x = 2/5*((625/4-5*(y+109/4))^(1/2)-25/2) or x = -2/5*((625/4-5*(y+109/4))^(1/2)+25/2) ) i y > 4
y-4 > 0
y-4 > 0 // + 4
y > 4
x in { -5, 2/5*((625/4-5*(y+109/4))^(1/2)-25/2), -2/5*((625/4-5*(y+109/4))^(1/2)+25/2) }
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