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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36*x-65 = 36/x // - 36/x
36*x-(36/x)-65 = 0
36*x-36*x^-1-65 = 0
36*x^1-36*x^-1-65*x^0 = 0
(36*x^2-65*x^1-36*x^0)/(x^1) = 0 // * x^2
x^1*(36*x^2-65*x^1-36*x^0) = 0
x^1
36*x^2-65*x-36 = 0
36*x^2-65*x-36 = 0
DELTA = (-65)^2-(-36*4*36)
DELTA = 9409
DELTA > 0
x = (9409^(1/2)+65)/(2*36) or x = (65-9409^(1/2))/(2*36)
x = 9/4 or x = -4/9
x in { -4/9, 9/4}
x in { -4/9, 9/4 }
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