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D( x )
1-(4*x) < 0
1-(4*x) < 0
1-(4*x) < 0
1-4*x < 0
1-4*x < 0 // - 1
-4*x < -1 // : -4
x > -1/(-4)
x > 1/4
x in (-oo:1/4>
(1-(4*x))^(1/4) = 0
(1-4*x)^(1/4) = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
x = 1/4
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