# Thread: What kind of a problem is this?

1. ## What kind of a problem is this?

I have the following problem to solve but don't recognise what type of problem this actually is let alone how to solve it:

Determine those values of k for which

| k k | = 0
| 8 4k |

the | are supposed to be continuous lines.

Is this comething to do with eigenvectors/eigenvalues? or maybe complex numbers?

Cheers,

Alex.

2. Given the matrix $\left( {\begin{array}{cc} a & b \\ c & d \\\end{array}} \right)$ then its determinant is $\left| {\begin{array}{cc} a & b \\ c & d \\
\end{array}} \right| = ad - bc$