Consider the following simultaneous equations (with $c_1$ and $c_2$ being constants):

- $3x_1+2x_2=c_1$
- $4x_1+x_2=c_2$

The characteristic equation for these simultaneous equation is

- $\lambda^2 – 4 \lambda – 5=0$
- $\lambda^2 – 4 \lambda + 5=0$
- $\lambda^2 + 4 \lambda – 5=0$
- $\lambda^2 + 4 \lambda + 5=0$