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P(x)= x³ + 3x²+3x + 1
x= -1  then    x+1  is a factor of P(x)
to get the other factors divide
= x²+2x+1 =  (x+1)(x+1)
(x+1)(x+1)(x+1) = 0
the other two zeros are also  -1
0 0 0
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