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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
144/x = x // - x
144/x-x = 0
144*x^-1-1*x^1 = 0
(144*x^0-1*x^2)/(x^1) = 0 // * x^2
x^1*(144*x^0-1*x^2) = 0
x^1
144-x^2 = 0
144-x^2 = 0
DELTA = 0^2-(-1*4*144)
DELTA = 576
DELTA > 0
x = (576^(1/2)+0)/(-1*2) or x = (0-576^(1/2))/(-1*2)
x = -12 or x = 12
x in { -12, 12}
x in { -12, 12 }
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