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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(98*x^2-4)/(x-2) = 0
98*x^2 = 4 // : 98
x^2 = 2/49
x^2 = 2/49 // ^ 1/2
abs(x) = (2/49)^(1/2)
x = (2/49)^(1/2) or x = -(2/49)^(1/2)
x in { (2/49)^(1/2), -(2/49)^(1/2) }
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