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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(2916/(x^2)) = 0
4*x-2916*x^-2 = 0
4*x^1-2916*x^-2 = 0
(4*x^3-2916*x^0)/(x^2) = 0 // * x^4
x^2*(4*x^3-2916*x^0) = 0
x^2
4*x^3-2916 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 9, -9, 12, -12, 18, -18, 27, -27, 36, -36, 54, -54, 81, -81, 108, -108, 162, -162, 243, -243, 324, -324, 486, -486, 729, -729, 972, -972, 1458, -1458, 2916, -2916 }
1
x = 1
4*x^3-2916 = -2912
1
-1
x = -1
4*x^3-2916 = -2920
-1
2
x = 2
4*x^3-2916 = -2884
2
-2
x = -2
4*x^3-2916 = -2948
-2
3
x = 3
4*x^3-2916 = -2808
3
-3
x = -3
4*x^3-2916 = -3024
-3
4
x = 4
4*x^3-2916 = -2660
4
-4
x = -4
4*x^3-2916 = -3172
-4
6
x = 6
4*x^3-2916 = -2052
6
-6
x = -6
4*x^3-2916 = -3780
-6
9
x = 9
4*x^3-2916 = 0
9
x-9
4*x^2+36*x+324
4*x^3-2916
x-9
36*x^2-4*x^3
36*x^2-2916
324*x-36*x^2
324*x-2916
2916-324*x
0
4*x^2+36*x+324 = 0
DELTA = 36^2-(4*4*324)
DELTA = -3888
DELTA < 0
x in { 9}
x = 9
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