6(1 - 3k2)
6(3k2 - 1)
6(3k - 1)
6(1 - 3k)
Correct answer is C
54k2−63k+1=6(9k2−1)3k+1
= 6(3k+1)−(3k−1)3k+1
= 6(3k - 1)
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