Question

There are two values of a for which the determinant, $\Delta =\begin{bmatrix}1& -2& 5\\\[0.3em]0& a& 1\\\[0.3em] 0& 4& 2a\\\[0.3em] \end{bmatrix} = 86$, then the sum of these values of a is:

• A. $\sqrt{41}$
• B. 0
• C. $- \sqrt{41}$
• D. $2 \sqrt{41}$

Answer 1

Answer: (B)

0

Answer 2

The correct option is (B): 0