Factorise p to power 4 minus 81q to power 4
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p^4-81q^4
=(p^2)^2-(9q^2)^2
=(p^2-9q^2)(p^2+9q^2)
=(p)^2-(3q)^2(p^2+9q^2)
=(p-3q)(p+3q)(p^2+9q^2) answer
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