If the following matrix
$$
\begin{bmatrix}
40 & -29 & -11 \\
-18 & 30 & -12 \\
26 & 24 & -50
\end{bmatrix}
$$
has a complex eigen value $\lambda\neq 0$, then matrix has must have an eigenvalue
a. $\lambda +20$
b. $\lambda-20$
c. $20- \lambda$
d. $-20- \lambda$
Can anyone help me please....