find a polynomial funciton of degree 3 with real coefficeints that has given zeros -1,2,-6. what is missing? x^3+__x^2-8x-12.

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A polynomial function of degree three with zeros at -1, 2, 6 would be f(x)=(x+1)(x-2)(x-6)=x^3-7x^2+4x+12. This polynomial is unique, so there is no number that would make x^3+__x^2-8x-12 work.