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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
x = (2*k)/(x+2) // - (2*k)/(x+2)
x-((2*k)/(x+2)) = 0
x-2*k*(x+2)^-1 = 0
(-2*k)/(x+2)+x = 0
(-2*k)/(x+2)+(x*(x+2))/(x+2) = 0
x*(x+2)-2*k = 0
x^2-2*k+2*x = 0
(x^2-2*k+2*x)/(x+2) = 0
(x^2-2*k+2*x)/(x+2) = 0 // * x+2
x^2-2*k+2*x = 0
x^2-2*k+2*x = 0
DELTA = 2^2-(-2*1*4*k)
DELTA = 8*k+4
8*k+4 = 0
8*k+4 = 0 // - 4
8*k = -4 // : 8
k = -4/8
k = -1/2
DELTA = 0 <=> t_3 = -1/2
x = -2/(1*2) i k = -1/2
x = -1 i k = -1/2
( x = ((8*k+4)^(1/2)-2)/(1*2) or x = (-(8*k+4)^(1/2)-2)/(1*2) ) i k > -1/2
( x = ((8*k+4)^(1/2)-2)/2 or x = (-((8*k+4)^(1/2)+2))/2 ) i k > -1/2
k+1/2 > 0
k+1/2 > 0 // - 1/2
k > -1/2
x in { -1, ((8*k+4)^(1/2)-2)/2, (-((8*k+4)^(1/2)+2))/2 }
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