b) Given $A = \begin{pmatrix} a & b & c \\ d & e & f \\ g & h & i \end{pmatrix}$ and $B = \begin{pmatrix} -3a & -3b & -3c \\ 2a + g & 2b + h & 2c + i \\ d & e & f \end{pmatrix}$. If $|A| = 3$, find $|B|$. (6 marks)
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$|A| = \begin{vmatrix} a & b & c \\ d & e & f \\ g & h & i \end{vmatrix} = a(ei - fh) - b(di - fg) + c(dh - eg)$ Show more…
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