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D( x )
(5*x^4)/4-x = 0
(5*x^4)/4-x = 0
(5*x^4)/4-x = 0
5/4*x^4-x = 0
x*(5/4*x^3-1) = 0
5/4*x^3 = 1 // : 5/4
x^3 = 4/5
x^3 = 4/5 // ^ 1/3
x = (4/5)^(1/3)
x = 0
x = 0
x in (-oo:0) U (0:(4/5)^(1/3)) U ((4/5)^(1/3):+oo)
((4*x)/16-x^2)/((5*x^4)/4-x) = 0
(1/4*x-x^2)/(5/4*x^4-x) = 0
1/4*x-x^2 = 0
x*(1/4-x) = 0
1/4-x = 0 // - 1/4
-x = -1/4 // * -1
x = 1/4
x*(x-1/4) = 0
5/4*x^4-x = 0
x*(5/4*x^3-1) = 0
5/4*x^3 = 1 // : 5/4
x^3 = 4/5
x^3 = 4/5 // ^ 1/3
x = (4/5)^(1/3)
x*(x-(4/5)^(1/3)) = 0
(x*(x-1/4))/(x*(x-(4/5)^(1/3))) = 0
( x-1/4 )
x-1/4 = 0 // + 1/4
x = 1/4
( x )
x = 0
x in { 0}
x = 1/4
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