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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
72/x = x // - x
72/x-x = 0
72*x^-1-1*x^1 = 0
(72*x^0-1*x^2)/(x^1) = 0 // * x^2
x^1*(72*x^0-1*x^2) = 0
x^1
72-x^2 = 0
72-x^2 = 0
DELTA = 0^2-(-1*4*72)
DELTA = 288
DELTA > 0
x = (288^(1/2)+0)/(-1*2) or x = (0-288^(1/2))/(-1*2)
x = -6*2^(1/2) or x = 6*2^(1/2)
x in { -6*2^(1/2), 6*2^(1/2)}
x in { -6*2^(1/2), 6*2^(1/2) }
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