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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)
2*x-(98/(x^2))-12 = 0
2*x-98*x^-2-12 = 0
2*x^1-98*x^-2-12*x^0 = 0
(2*x^3-12*x^2-98*x^0)/(x^2) = 0 // * x^4
x^2*(2*x^3-12*x^2-98*x^0) = 0
x^2
2*x^3-12*x^2-98 = 0
{ 1, -1, 2, -2, 7, -7, 14, -14, 49, -49, 98, -98 }
1
x = 1
2*x^3-12*x^2-98 = -108
1
-1
x = -1
2*x^3-12*x^2-98 = -112
-1
2
x = 2
2*x^3-12*x^2-98 = -130
2
-2
x = -2
2*x^3-12*x^2-98 = -162
-2
7
x = 7
2*x^3-12*x^2-98 = 0
7
x-7
2*x^2+2*x+14
2*x^3-12*x^2-98
x-7
14*x^2-2*x^3
2*x^2-98
14*x-2*x^2
14*x-98
98-14*x
0
2*x^2+2*x+14 = 0
DELTA = 2^2-(2*4*14)
DELTA = -108
DELTA < 0
x in { 7}
x = 7
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