Let $M$ be a $2 \times 2$ matrix with eigenvalues $\lambda_1 = -0.4, \ \lambda_2 = 1$ with corresponding eigenvectors

$$\mathbf{v}_1 = \left[\begin{array}{c} -2\cr 2 \end{array}\right], \mathbf{v}_2= \left[\begin{array}{c} 0\cr 1 \end{array}\right].$$ Consider the difference equation

$$\mathbf{x}_{k+1} = M\mathbf{x}_k$$ with initial condition $\mathbf{x}_0 = \left[\begin{array}{c} 9\cr 5 \end{array}\right]$.

---

Write the initial condition as a linear combination of the eigenvectors of $M$.

That is, write $\mathbf{x}_0 = c_1 \mathbf{v_1} + c_2 \mathbf{v_2}$ $=$ $\mathbf{v_1} +$$\mathbf{v_2}$

---

In general, $\mathbf{x}_k =$ $\big($ $\big)^k \ \mathbf{v}_1+$ $\big($ $\big)^k \ \mathbf{v}_2$

---

Specifically, $\mathbf{x}_{2} =$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$

---

For large $k$, $\mathbf{x}_{k} \rightarrow$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$