how to split x^4-81 (step by step)
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x^4-81
(x^2)^2-(9)^2
as this term now forms an identity ---a^2-b^2
(x^2-9) (x^2+9)
(x^2)^2-(9)^2
as this term now forms an identity ---a^2-b^2
(x^2-9) (x^2+9)
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