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

Answer 1

(c) 3(2m − 3)(2m + 3)

$$\begin{gathered} 12m^2-27 \\ =3(4m^2-9) \\ =3(2m-3)(2m+3) \end{gathered}$$