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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)
60*x-(480/(x^2)) = 0
60*x-480*x^-2 = 0
60*x^1-480*x^-2 = 0
(60*x^3-480*x^0)/(x^2) = 0 // * x^4
x^2*(60*x^3-480*x^0) = 0
x^2
60*x^3-480 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 5, -5, 6, -6, 8, -8, 10, -10, 12, -12, 15, -15, 16, -16, 20, -20, 24, -24, 30, -30, 32, -32, 40, -40, 48, -48, 60, -60, 80, -80, 96, -96, 120, -120, 160, -160, 240, -240, 480, -480 }
1
x = 1
60*x^3-480 = -420
1
-1
x = -1
60*x^3-480 = -540
-1
2
x = 2
60*x^3-480 = 0
2
x-2
60*x^2+120*x+240
60*x^3-480
x-2
120*x^2-60*x^3
120*x^2-480
240*x-120*x^2
240*x-480
480-240*x
0
60*x^2+120*x+240 = 0
DELTA = 120^2-(4*60*240)
DELTA = -43200
DELTA < 0
x in { 2}
x = 2
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