Question 626495
Hint: 


Factor {{{x^3+x^2-4x-4}}} to get


{{{x^3+x^2-4x-4}}}


{{{(x^3+x^2)+(-4x-4)}}}


{{{x^2(x+1)-4(x+1)}}}


{{{(x^2-4)(x+1)}}}


{{{(x-2)(x+2)(x+1)}}}


So {{{x^3+x^2-4x-4}}} factors to {{{(x-2)(x+2)(x+1)}}}


Hopefully this will help you find the zeros. If not, let me know. Thanks.


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