Hi,

$\displaystyle C = \left(\begin{array}{ccc}s&3&4\\1+s&1-s&2\\0&-1&1\end{array}\right)$

For which two complex values of s is C singular?

a) What is meant by the term singular? Is it just ones across the matrix or something else entirely?

b) How do I begin to work it out, what steps should I take?

EDIT: I understand it now but thanks to anyone who attempted it for me