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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(36/x) = 0
4*x-36*x^-1 = 0
4*x^1-36*x^-1 = 0
(4*x^2-36*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-36*x^0) = 0
x^1
4*x^2-36 = 0
4*x^2-36 = 0
DELTA = 0^2-(-36*4*4)
DELTA = 576
DELTA > 0
x = (576^(1/2)+0)/(2*4) or x = (0-576^(1/2))/(2*4)
x = 3 or x = -3
x in { -3, 3}
x in { -3, 3 }
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