Question 1102277
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Factor

{{{x^4 - 3x^2 - 4}}} = {{{(x^2-4)*(x^2+1)}}}.


The polynomial  x^2 - 4 has the real roots  2  and  -2.


The polynomial x^2+1 has complex roots  i  and  -i.


The list of all roots is  -2,  2,  i  and  -i.
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I do not need your hint.