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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30=18k
Na+-K+ ATPase
K+15
0
When a number is given followed by K it means the weight of the gold. Most have 10K, 12K, 14k and 18k. I have never seen 40k.