(5) Find the determinants for the matrices below, assuming that \begin{bmatrix} a & b & c \\ d & e & f \\ g & h & i \end{bmatrix} has determinant 3 \\ (a) A = \begin{bmatrix} a & b & c \\ 4d & 4e & 4f \\ g & h & i \end{bmatrix} \\ (b) A = \begin{bmatrix} d - 2g & e - 2h & f - 2i \\ a & b & c \\ g & h & i \end{bmatrix}
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