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Answer:
They are indeed the zeroes
Step-by-step explanation:
-1 | 1 5 7 3
__-1_-4_-3_
1 4 3 | 0
-3 | 1 5 7 3
__ -3_-6_-3_
1 2 1 | 0
Therefore, x=-1 and x=-3 are the zeroes of the cubic polynomial as the factor (x+1)² has a multiplicity of 2.