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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/12 = 27/x // - 27/x
x/12-(27/x) = 0
x/12-27*x^-1 = 0
1/12*x^1-27*x^-1 = 0
(1/12*x^2-27*x^0)/(x^1) = 0 // * x^2
x^1*(1/12*x^2-27*x^0) = 0
x^1
(1/12)*x^2-27 = 0
(1/12)*x^2-27 = 0
DELTA = 0^2-(-27*4*(1/12))
DELTA = 9
DELTA > 0
x = (9^(1/2)+0)/(2*(1/12)) or x = (0-9^(1/2))/(2*(1/12))
x = 18 or x = -18
x in { -18, 18}
x in { -18, 18 }
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