assuming you mean (3k+4)^2 = 9k^2 + 24k + 16
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When factored it is: (3k+5)(k-1)
4 plus (4 squared) = 8
Take 3k from both sides to get k-3 equals 4, so k is 7
(j^3 + 3k^4)(j^6 - 3j^3k^4 + 9k^8)
5k + 7 + 3k can be simplified into 8k + 7