4a(a - 3b) + (3b - c)2
(2a + 3b - c)(2a + 3b + c)
(2a - 3b + c)(2a - 3b - c)
4a(a - 3b) + (3b + c)
Correct answer is C
4a2 - 12ab - C2 + 9b2
rearranges: (4a2 - 12ab + 9b2) - c2
(2a - 3b)(2a - 3b) - c2 = (2a - 3b)2 - c2
= (2a - 3b + c)(2a - 3b - c)
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