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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x/2)*x = (6-x)/x // - (6-x)/x
(x/2)*x-((6-x)/x) = 0
(-1*(6-x))/x+(x^2)/2 = 0
(-1*2*(6-x))/(2*x)+(x*x^2)/(2*x) = 0
x*x^2-1*2*(6-x) = 0
x^3+2*x-12 = 0
x^3+2*x-12 = 0
x^3+2*x-12 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 12, -12 }
1
x = 1
x^3+2*x-12 = -9
1
-1
x = -1
x^3+2*x-12 = -15
-1
2
x = 2
x^3+2*x-12 = 0
2
x-2
x^2+2*x+6
x^3+2*x-12
x-2
2*x^2-x^3
2*x^2+2*x-12
4*x-2*x^2
6*x-12
12-6*x
0
x^2+2*x+6 = 0
DELTA = 2^2-(1*4*6)
DELTA = -20
DELTA < 0
x in { 2}
x-2 = 0
(x-2)/(2*x) = 0
(x-2)/(2*x) = 0 // * 2*x
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 2
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