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k + 18k + 81 = 19k + 81 which cannot be factorised.

HOWEVER

If the question was about k2 + 18k + 81, but was foiled by the inability of this browser, then the answer is

k2 + 18k + 81 = (k + 9)2

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Q: What are the factors for k plus 18k plus 81?
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