4a2 - 12ab + 9b2 - 4c2

A (2a - 3b + 2c) (2a - 3b - 2c) 

B (2a - 3b - 2c) (2a - 3b - 2c) 

C (2a - 3b + 2c) (2a + 3b - 2c) 

D (2a + 3b + 2c) (2a + 3b - 2c) 

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) 

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