Find the Inverse of the Invertible Matrix $\left[ \begin{array} { l l l } 1 & 0 & 0 \\ 4 & 1 & 0 \\ 0 & 3 & 1 \end{array} \right]$

question 61

Multiple Choice

Find the inverse of the invertible matrix.
- $\left[ \begin{array} { l l l } 1 & 0 & 0 \\ 4 & 1 & 0 \\ 0 & 3 & 1 \end{array} \right]$

• A) \(\left[ \begin{array} { r r r } 1 & 3 & - 12 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{array} \right]\)
• B) \(\left[ \begin{array} { r r r } 1 & 0 & 0 \\ - 4 & 1 & 0 \\ 12 & - 3 & 1 \end{array} \right]\)
• C) \(\left[ \begin{array} { l l l } 1 & 0 & 0 \\ 4 & 1 & 0 \\ 0 & 0 & 3 \end{array} \right]\)
• D) \(\left[ \begin{array} { r r r } 1 & 0 & 0 \\ 3 & - 1 & 0 \\ - 12 & 4 & 1 \end{array} \right]\)

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