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D( x )
x/4 <= 0
x/4 <= 0
x/4 <= 0
1/4*x+0 <= 0 // - 0
1/4*x <= 0 // : 1/4
x <= 0/1/4
x <= 0
x in (0:+oo)
((X^5)/4)*ln(x/4) = 0
1/4*X^5*ln(x/4) = 0 // : 1/4*X^5
ln(x/4) = 0
ln(x/4) = ln(e^0)
x/4 = e^0
x/4-e^0 = 0
1/4*x-1 = 0 // + 1
1/4*x = 1 // : 1/4
x = 1/1/4
x = 4
x = 4
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