Q. 2

18t^2 - 2

\Rightarrow 18t^2 + 0t -2

\Rightarrow 18t^2 - 6t + 6t - 2

\Rightarrow 6t(3t - 1) + 2(3t + 1)

\Rightarrow (6t + 2)(3t - 1)

\Rightarrow 2(3t + 1)(3t - 1)