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T^4 - 81 = (T² + 9) (T² - 9) = (T² + 9)(T + 3)(T - 3)

Including complex numbers this can be further factorised into:

(T + 3i) (T - 3i) (T + 3) (T - 3)

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9y ago
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Q: What is the factorization of T power 4 - 81?
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