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D( x )
x-2 = 0
x+2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:2) U (2:+oo)
(x+1)/(x+2) = (2*x)/(x-2) // - (2*x)/(x-2)
(x+1)/(x+2)-((2*x)/(x-2)) = 0
(x+1)/(x+2)-2*x*(x-2)^-1 = 0
(x+1)/(x+2)+(-2*x)/(x-2) = 0
((x+1)*(x-2))/((x+2)*(x-2))+(-2*x*(x+2))/((x+2)*(x-2)) = 0
(x+1)*(x-2)-2*x*(x+2) = 0
-x^2-5*x-2 = 0
-x^2-5*x-2 = 0
-1*(x^2+5*x+2) = 0
x^2+5*x+2 = 0
DELTA = 5^2-(1*2*4)
DELTA = 17
DELTA > 0
x = (17^(1/2)-5)/(1*2) or x = (-17^(1/2)-5)/(1*2)
x = (17^(1/2)-5)/2 or x = (-(17^(1/2)+5))/2
-1*(x+(17^(1/2)+5)/2)*(x-((17^(1/2)-5)/2)) = 0
(-1*(x+(17^(1/2)+5)/2)*(x-((17^(1/2)-5)/2)))/((x+2)*(x-2)) = 0
(-1*(x+(17^(1/2)+5)/2)*(x-((17^(1/2)-5)/2)))/((x+2)*(x-2)) = 0 // * (x+2)*(x-2)
-1*(x+(17^(1/2)+5)/2)*(x-((17^(1/2)-5)/2)) = 0
( x+(17^(1/2)+5)/2 )
x+(17^(1/2)+5)/2 = 0 // - (17^(1/2)+5)/2
x = -((17^(1/2)+5)/2)
( x-((17^(1/2)-5)/2) )
x-((17^(1/2)-5)/2) = 0 // + (17^(1/2)-5)/2
x = (17^(1/2)-5)/2
x in { -((17^(1/2)+5)/2), (17^(1/2)-5)/2 }
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