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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)
63/(x^2) = x+4 // - x+4
63/(x^2)-x-4 = 0
63*x^-2-1*x^1-4*x^0 = 0
(63*x^0-1*x^3-4*x^2)/(x^2) = 0 // * x^4
x^2*(63*x^0-1*x^3-4*x^2) = 0
x^2
63-x^3-4*x^2 = 0
{ 1, -1, 3, -3, 7, -7, 9, -9, 21, -21, 63, -63 }
1
x = 1
63-x^3-4*x^2 = 58
1
-1
x = -1
63-x^3-4*x^2 = 60
-1
3
x = 3
63-x^3-4*x^2 = 0
3
x-3
-x^2-7*x-21
63-x^3-4*x^2
x-3
x^3-3*x^2
63-7*x^2
7*x^2-21*x
63-21*x
21*x-63
0
-x^2-7*x-21 = 0
DELTA = (-7)^2-(-21*(-1)*4)
DELTA = -35
DELTA < 0
x in { 3}
x = 3
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