Mathematics 10 — Exercise 3.5 · Q4 A

Full question

Find the adjoint of the following matrix.

Step-by-step solution

1. Swap the two diagonal entries.

   $$\left[\begin{array}{cc}d& b\\ c& a\end{array}\right]$$

2. Negate each off-diagonal entry.

   $$\left[\begin{array}{cc}d& -b\\ -c& a\end{array}\right]$$

Answer

The final answer is shown below.