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factor the following trinomail
w^18-9w^9y^5+14y^10

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    =w^18-7w^9y^5-2w^9y^5+14y^10=
    (w^18-7w^9y^5)-(2w^9y^5-14y^10)=
    w^9(w^9-7y^5)-2y^5(w^9-7y^5)=
    (w^9-7y^5)(w^9-2y^5)

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