Factorization factor: the second power of 9A - 6ac + the square of C - the second power of 4B

Factorization factor: the second power of 9A - 6ac + the square of C - the second power of 4B

The second power of 9A - 6ac + the square of C - the second power of 4B
=(3a-c)²-4b²
=(3a-c+2b)(3a-c-2b)