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12m2 – 27 =? 

A. (2m – 3) (3m – 9) 

B. 3(2m – 9) (3m – 1) 

C. 3(2m – 9) (2m + 1) 

D. none of these

1 Answer

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Best answer

12m2 – 27 = 3(4m2 – 9) (taking 3 as common from whole) 

= 3(2m – 3)(2m + 3)  \(\because\) a2 – b2 = (a – b)(a + b)

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