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