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D( x )
36-x^2 = 0
36-x^2 = 0
36-x^2 = 0
-1*x^2 = -36 // : -1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in (-oo:-6) U (-6:6) U (6:+oo)
(x^2-(13*x)-36)/(36-x^2) = 0
(x^2-13*x-36)/(36-x^2) = 0
x^2-13*x-36 = 0
x^2-13*x-36 = 0
DELTA = (-13)^2-(-36*1*4)
DELTA = 313
DELTA > 0
x = (313^(1/2)+13)/(1*2) or x = (13-313^(1/2))/(1*2)
x = (313^(1/2)+13)/2 or x = (13-313^(1/2))/2
(x-((13-313^(1/2))/2))*(x-((313^(1/2)+13)/2)) = 0
((x-((13-313^(1/2))/2))*(x-((313^(1/2)+13)/2)))/(36-x^2) = 0
( x-((13-313^(1/2))/2) )
x-((13-313^(1/2))/2) = 0 // + (13-313^(1/2))/2
x = (13-313^(1/2))/2
( x-((313^(1/2)+13)/2) )
x-((313^(1/2)+13)/2) = 0 // + (313^(1/2)+13)/2
x = (313^(1/2)+13)/2
x in { (13-313^(1/2))/2, (313^(1/2)+13)/2 }
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