Question

If $A$=$\begin{vmatrix} 3 & 1 \\\[0.1em] -1 & 2 \end{vmatrix}$ then $A^2-5A=$

• A. $7I$
• B. $-7I$
• C. $2I$
• D. $-3I$

Answer 1

Answer: (B)

$-7I$

Answer 2

The correct option is (B): $-7I$