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If that's 81 - 16k2, it factors neatly as the difference of squares into (9 - 4k)(9 + 4k)

If that's 81 + 16k2, it factors to (4k -9i)(4k + 9i) where i is the square root of negative one.

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11y ago
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Q: How do you factor 81 16k2?
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