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x in (-oo:+oo)
(8/2)*X+2*x^2+10*x+2 = 0
4*X+2*x^2+10*x+2 = 0
DELTA = 10^2-(2*4*(4*X+2))
DELTA = 100-8*(4*X+2)
100-8*(4*X+2) = 0
100-8*(4*X+2) = 0
84-32*X = 0
84-32*X = 0
84-32*X = 0 // - 84
-32*X = -84 // : -32
X = -84/(-32)
X = 21/8
DELTA = 0 <=> t_1 = 21/8
x = -10/(2*2) i X = 21/8
x = -5/2 i X = 21/8
( x = ((100-8*(4*X+2))^(1/2)-10)/(2*2) or x = (-(100-8*(4*X+2))^(1/2)-10)/(2*2) ) i X > 21/8
( x = ((100-8*(4*X+2))^(1/2)-10)/4 or x = (-((100-8*(4*X+2))^(1/2)+10))/4 ) i X > 21/8
X-21/8 > 0
X-21/8 > 0 // + 21/8
X > 21/8
x in { -5/2, ((100-8*(4*X+2))^(1/2)-10)/4, (-((100-8*(4*X+2))^(1/2)+10))/4 }
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