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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9*p = 6/p+18 // - 6/p+18
9*p-(6/p)-18 = 0
9*p-6*p^-1-18 = 0
9*p^1-6*p^-1-18*p^0 = 0
(9*p^2-18*p^1-6*p^0)/(p^1) = 0 // * p^2
p^1*(9*p^2-18*p^1-6*p^0) = 0
p^1
9*p^2-18*p-6 = 0
9*p^2-18*p-6 = 0
DELTA = (-18)^2-(-6*4*9)
DELTA = 540
DELTA > 0
p = (540^(1/2)+18)/(2*9) or p = (18-540^(1/2))/(2*9)
p = (6*15^(1/2)+18)/18 or p = (18-6*15^(1/2))/18
p in { (18-6*15^(1/2))/18, (6*15^(1/2)+18)/18}
p in { (18-6*15^(1/2))/18, (6*15^(1/2)+18)/18 }
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