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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
p-8 = -15/p // + -15/p
p-(-15/p)-8 = 0
p+15*p^-1-8 = 0
1*p^1+15*p^-1-8*p^0 = 0
(1*p^2-8*p^1+15*p^0)/(p^1) = 0 // * p^2
p^1*(1*p^2-8*p^1+15*p^0) = 0
p^1
p^2-8*p+15 = 0
p^2-8*p+15 = 0
DELTA = (-8)^2-(1*4*15)
DELTA = 4
DELTA > 0
p = (4^(1/2)+8)/(1*2) or p = (8-4^(1/2))/(1*2)
p = 5 or p = 3
p in { 3, 5}
p in { 3, 5 }
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