Tick (✓) the correct answer

Question:

Tick (✓) the correct answer:

(12m2 − 27) = ?

(a) (2m − 3)(3m − 9)

(b) 3(2m − 9)(3m − 1)

(c) 3(2m − 3)(2m + 3)

(d) none of these

Solution:

(c) 3(2m − 3)(2m + 3)

$12 m^{2}-27$

$=3\left(4 m^{2}-9\right)$

$=3(2 m-3)(2 m+3)$

 

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