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x in (-oo:+oo)
y = (-1/2)*x^2-((7/2)*x)-4 // - (-1/2)*x^2-((7/2)*x)-4
(7/2)*x-((-1/2)*x^2)+y+4 = 0
(1/2)*x^2+(7/2)*x+y+4 = 0
1/2*x^2+7/2*x+y+4 = 0
DELTA = (7/2)^2-(1/2*4*(y+4))
DELTA = 49/4-2*(y+4)
49/4-2*(y+4) = 0
(-2*4*(y+4))/4+49/4 = 0
49-2*4*(y+4) = 0
17-8*y = 0
(17-8*y)/4 = 0
(17-8*y)/4 = 0 // * 4
17-8*y = 0
17-8*y = 0 // - 17
-8*y = -17 // : -8
y = -17/(-8)
y = 17/8
DELTA = 0 <=> t_1 = 17/8
x = -7/2/(1/2*2) i y = 17/8
x = -7/2 i y = 17/8
( x = ((49/4-2*(y+4))^(1/2)-7/2)/(1/2*2) or x = (-(49/4-2*(y+4))^(1/2)-7/2)/(1/2*2) ) i y > 17/8
( x = (49/4-2*(y+4))^(1/2)-7/2 or x = -((49/4-2*(y+4))^(1/2)+7/2) ) i y > 17/8
y-17/8 > 0
y-17/8 > 0 // + 17/8
y > 17/8
x in { -7/2, (49/4-2*(y+4))^(1/2)-7/2, -((49/4-2*(y+4))^(1/2)+7/2) }
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