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D( x )
5*x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
(25*x^6-(45*x^4))/(5*x) = 0
(25*x^6-45*x^4)/(5*x) = 0
25*x^6-45*x^4 = 0
5*x^4*(5*x^2-9) = 0
5*x^2 = 9 // : 5
x^2 = 9/5
x^2 = 9/5 // ^ 1/2
abs(x) = (9/5)^(1/2)
x = (9/5)^(1/2) or x = -(9/5)^(1/2)
5*x^4*(x-(9/5)^(1/2))*(x+(9/5)^(1/2)) = 0
(5*x^4*(x-(9/5)^(1/2))*(x+(9/5)^(1/2)))/(5*x) = 0
( 5*x^4 )
5*x^4 = 0 // : 5
x^4 = 0
x = 0
( x+(9/5)^(1/2) )
x+(9/5)^(1/2) = 0 // - (9/5)^(1/2)
x = -(9/5)^(1/2)
( x-(9/5)^(1/2) )
x-(9/5)^(1/2) = 0 // + (9/5)^(1/2)
x = (9/5)^(1/2)
x in { 0}
x in { -(9/5)^(1/2), (9/5)^(1/2) }
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