# Properties of the Determinant I

**Algebra**Level 3

The determinant has the properties:

\( \det(AB) = \det(A)\det(B) \\ \det(A) = \det(A^T) \)

Hence, given that \( \begin{vmatrix} a_1 & a_2 & a_3 \\ a_4 & a_5 & a_6 \\ a_7 & a_8 & a_9 \\ \end{vmatrix} = 16 \)

Find \( \begin{vmatrix} 4a_1 & 2a_2 & 4a_3 \\ 2a_4 & a_5 & 2a_6 \\ 4a_7 & 2a_8 & 4a_9 \\ \end{vmatrix} \)