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