If -1 is one of the zero of the polynomial px=3xcube -5x square-11x -3
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p(-1)=3(-1)*(-1)*(-1)-5(-1)*(-1)-11(-1)-3=0
=-3-5+11=0
-8+11=0
3=0
so -1 is not a zero of this polynomial
=-3-5+11=0
-8+11=0
3=0
so -1 is not a zero of this polynomial
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