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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x^2+5*x+2/x+3 = 0
2*x^2+5*x^1+2*x^-1+3*x^0 = 0
(2*x^3+5*x^2+3*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^3+5*x^2+3*x^1+2*x^0) = 0
x^1
2*x^3+5*x^2+3*x+2 = 0
{ 1, -1, 2, -2 }
1
x = 1
2*x^3+5*x^2+3*x+2 = 12
1
-1
x = -1
2*x^3+5*x^2+3*x+2 = 2
-1
2
x = 2
2*x^3+5*x^2+3*x+2 = 44
2
-2
x = -2
2*x^3+5*x^2+3*x+2 = 0
-2
x+2
2*x^2+x+1
2*x^3+5*x^2+3*x+2
x+2
-2*x^3-4*x^2
x^2+3*x+2
-x^2-2*x
x+2
-x-2
0
2*x^2+x+1 = 0
DELTA = 1^2-(1*2*4)
DELTA = -7
DELTA < 0
x in { -2}
x = -2
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