Pembahasan Soal Matematika UN SMA/SMK: Bab Matriks (#1)

Video berikut menjelaskan penyelesaian soal UN 2010 dari Bab Matriks.

Diketahui matriks \displaystyle A=\left( \begin{matrix} 4a & 8 & 4 \\ 6 & -1 & -3b \\ 5 & 3c & 9 \\ \end{matrix} \right) dan \displaystyle B=\left( \begin{matrix} 12 & 8 & 4 \\ 6 & -1 & -3a \\ 5 & b & 9 \\ \end{matrix} \right) . Jika \displaystyle A=B, maka \displaystyle a+b+c=\ldots .

A. -7

B. -5

C. -1

D. 5

E. 7

(UN 2010)

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