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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)
2*x+1 = 9/(x+2) // - 9/(x+2)
2*x-(9/(x+2))+1 = 0
2*x-9*(x+2)^-1+1 = 0
2*x-9/(x+2)+1 = 0
(2*x*(x+2))/(x+2)-9/(x+2)+(1*(x+2))/(x+2) = 0
2*x*(x+2)+1*(x+2)-9 = 0
2*x^2+4*x+x-9+2 = 0
2*x^2+5*x-7 = 0
2*x^2+5*x-7 = 0
2*x^2+5*x-7 = 0
DELTA = 5^2-(-7*2*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)-5)/(2*2) or x = (-81^(1/2)-5)/(2*2)
x = 1 or x = -7/2
(x+7/2)*(x-1) = 0
((x+7/2)*(x-1))/(x+2) = 0
((x+7/2)*(x-1))/(x+2) = 0 // * x+2
(x+7/2)*(x-1) = 0
( x+7/2 )
x+7/2 = 0 // - 7/2
x = -7/2
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -7/2, 1 }
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