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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
36/p = p-5 // - p-5
36/p-p+5 = 0
36*p^-1-1*p^1+5*p^0 = 0
(5*p^1-1*p^2+36*p^0)/(p^1) = 0 // * p^2
p^1*(5*p^1-1*p^2+36*p^0) = 0
p^1
5*p-p^2+36 = 0
5*p-p^2+36 = 0
DELTA = 5^2-(-1*4*36)
DELTA = 169
DELTA > 0
p = (169^(1/2)-5)/(-1*2) or p = (-169^(1/2)-5)/(-1*2)
p = -4 or p = 9
p in { -4, 9}
p in { -4, 9 }
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