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D( x )
5*x^3-(2*x^2) = 0
2*x-20 = 0
5*x^3-(2*x^2) = 0
5*x^3-(2*x^2) = 0
5*x^3-2*x^2 = 0
5*x^3-2*x^2 = 0
x^2*(5*x-2) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
2*x-20 = 0
2*x-20 = 0
2*x-20 = 0 // + 20
2*x = 20 // : 2
x = 20/2
x = 10
x in (-oo:0) U (0:2/5) U (2/5:10) U (10:+oo)
((x^2-(2*x)-80)/(5*x^3-(2*x^2)))*((X^3-x^2)/(2*x-20)) = 0
((x^2-2*x-80)/(5*x^3-2*x^2))*((X^3-x^2)/(2*x-20)) = 0
((x^2-2*x-80)*(X^3-x^2))/((5*x^3-2*x^2)*(2*x-20)) = 0
x^2-2*x-80 = 0
x^2-2*x-80 = 0
DELTA = (-2)^2-(-80*1*4)
DELTA = 324
DELTA > 0
x = (324^(1/2)+2)/(1*2) or x = (2-324^(1/2))/(1*2)
x = 10 or x = -8
(x+8)*(x-10) = 0
5*x^3-2*x^2 = 0
x^2*(5*x-2) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x^2*(x-2/5) = 0
((x+8)*(x-10)*(X^3-x^2))/(x^2*(x-2/5)*(2*x-20)) = 0
( X^3-x^2 )
-1*x^2 = -X^3 // : -1
x^2 = X^3
x^2 = X^3 // ^ 1/2
abs(x) = X^(3/2)
x = X^(3/2) or x = -X^(3/2)
( x+8 )
x+8 = 0 // - 8
x = -8
( x-10 )
x-10 = 0 // + 10
x = 10
x in { 10}
x in { X^(3/2), -X^(3/2), -8 }
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