factoring

factor these expressions
A) x^4+x^2+1
B) x^10+x^5+1

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1. A) (x^2 + x + 1) (x^2 - x +1)
B) (x^2 + x + 1) (x^8 - x^7 + x^5 - x^4 + x^3 - x + 1 )

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2. just curious, how did you get the second one??

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3. thanks!

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