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D( x )
(5-(2*x))^2 = 0
(5-(2*x))^2 = 0
(5-(2*x))^2 = 0
(5-2*x)^2 = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
x/((5-(2*x))^2) = 20.5 // - 20.5
x/((5-(2*x))^2)-20.5 = 0
x/((5-2*x)^2)-20.5 = 0
x/((5-2*x)^2)+(-20.5*(5-2*x)^2)/((5-2*x)^2) = 0
x-20.5*(5-2*x)^2 = 0
411*x-82*x^2-512.5 = 0
411*x-82*x^2-512.5 = 0
411*x-82*x^2-512.5 = 0
DELTA = 411^2-(-512.5*(-82)*4)
DELTA = 821
DELTA > 0
x = (821^(1/2)-411)/(-82*2) or x = (-821^(1/2)-411)/(-82*2)
x = (821^(1/2)-411)/(-164) or x = (821^(1/2)+411)/164
(x-((821^(1/2)-411)/(-164)))*(x-((821^(1/2)+411)/164)) = 0
((x-((821^(1/2)-411)/(-164)))*(x-((821^(1/2)+411)/164)))/((5-2*x)^2) = 0
((x-((821^(1/2)-411)/(-164)))*(x-((821^(1/2)+411)/164)))/((5-2*x)^2) = 0 // * (5-2*x)^2
(x-((821^(1/2)-411)/(-164)))*(x-((821^(1/2)+411)/164)) = 0
( x-((821^(1/2)+411)/164) )
x-((821^(1/2)+411)/164) = 0 // + (821^(1/2)+411)/164
x = (821^(1/2)+411)/164
( x-((821^(1/2)-411)/(-164)) )
x-((821^(1/2)-411)/(-164)) = 0 // + (821^(1/2)-411)/(-164)
x = (821^(1/2)-411)/(-164)
x in { (821^(1/2)+411)/164, (821^(1/2)-411)/(-164) }
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