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D( x )
2*x^2-4 = 0
2*x^2-4 = 0
2*x^2-4 = 0
2*x^2 = 4 // : 2
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
x in (-oo:-2^(1/2)) U (-2^(1/2):2^(1/2)) U (2^(1/2):+oo)
(8*x-2)/(2*x^2-4) = 0
8*x-2 = 0 // + 2
8*x = 2 // : 8
x = 2/8
x = 1/4
x = 1/4
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