Answer
$(x+1)(x-1)(x^4+x^2+1)$
Work Step by Step
Step 1. $x^6-1=(x^2)^3-1=(x^2-1)(x^4+x^2+1)$
Step 2. $(x^2-1)(x^4+x^2+1)=(x+1)(x-1)(x^4+x^2+1)$
Step 3. Thus $x^6-1=(x+1)(x-1)(x^4+x^2+1)$
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