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posted by Anonymous Monday, December 5, 2011 at 12:00am.

factor completely a^9+b^12 c^15

does not factor using rationals.

yes there's an a

= (a^3)^3 + (b^4c^5)^3 = (a^3 + b^4c^5)(x^6 - a^3b^4c^5 + b^8c^10)

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