Felix needs to determine whether $x+3$ is a factor of $f(x)=-2 x^4-8 x^3-2 x-63$.



How can Felix use the factor theorem to determine whether $x+3$ is a factor of $f(x)$?



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Felix evaluates [ ] and determines its value to be [ ]. Felix concludes that $x+3$ [ ] a factor of $f(x)=-2 x^4-8 x^3-2 x-63$.