4a2 - 12ab + 9b2 - 4c2
Solution
Correct Answer: Option A
• 4a2 - 12ab + 9b2 - 4c2
= (2a)2 - 2 . 2a . 3b + (3b)2 - 4c2
= (2a - 3b)2 - (2c)2
= (2a - 3b + 2c) (2a - 3b - 2c)
= (2a)2 - 2 . 2a . 3b + (3b)2 - 4c2
= (2a - 3b)2 - (2c)2
= (2a - 3b + 2c) (2a - 3b - 2c)
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