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