(3k-1)的平方-4(k+1)(2k-2)的觧

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(3k-1)的平方-4(k+1)(2k-2)的觧
(3k-1)的平方-4(k+1)(2k-2)的觧

(3k-1)的平方-4(k+1)(2k-2)的觧
(3k-1)的平方-4(k+1)(2k-2)
=9k²-6k+1-8(k+1)(k-1)
=9k²-6k+1-8k²+8
=k²-6k+9
=(k-3)²