Find the Inverse of A $$A = \left[ \begin{array} { c c c } - 4 & 12 & 4 \\8 & 20 & 0 \\12 & 4 & - 8\end{array} \right]$$

question 3

Multiple Choice

Find the inverse of A.​ $$A = \left[ \begin{array} { c c c } - 4 & 12 & 4 \\8 & 20 & 0 \\12 & 4 & - 8\end{array} \right]$$ ​

• A)​ \[A ^ { - 1 } = \frac { 1 } { 36 } \left[ \begin{array} { c c c }
• 10 & 7 & 5 \\
• 4 & - 1 & 2 \\
• - 13 & 10 & - 11
• \end{array} \right]\]
• B)​ \[A ^ { - 1 } = \frac { 1 } { 24 } \left[ \begin{array} { c c c }
• 10 & 7 & 5 \\
• 4 & 1 & 2 \\
• 13 & 10 & 11
• \end{array} \right]\]
• C)​ \[A ^ { - 1 } = \frac { 1 } { 28 } \left[ \begin{array} { c c c }
• - 10 & 7 & - 5 \\
• 4 & - 1 & 2 \\
• - 13 & 10 & - 11
• \end{array} \right]\]
• D)​ \[A ^ { - 1 } = \frac { 1 } { 36 } \left[ \begin{array} { c c c }
• - 10 & 7 & - 5 \\
• 4 & - 1 & 2 \\
• - 13 & 10 & - 11
• \end{array} \right]\]
• E)​ \[A ^ { - 1 } = \frac { 1 } { 28 } \left[ \begin{array} { c c c }
• 10 & 7 & 5 \\
• 4 & 1 & 2 \\
• 13 & 10 & 11
• \end{array} \right]\]

---

Definitions:

First-in

Commonly part of the term "First-in, First-out (FIFO)", a method used in inventory management where the oldest stock is sold first.

Labor

Work performed by humans that is used in the production of goods and services.

Equivalent Unit

A metric in cost accounting that quantifies the effort invested in partially finished units by equating it to the output of completely finished units.

First-in

implies the method where the earliest goods produced or acquired are the first to be used or sold.