## Sunday, November 19, 2017

Consider the following 2x2 matrix A where two elements are unknown and are marked by a and b. The eigen values of this matrix are -1 and 7. What are the values of a and b?

$$A = \begin{bmatrix} 1 & 4 \\ b & a \end{bmatrix}$$
1. a = 6, b = 4
2. a = 4, b = 6
3. a = 3, b = 5
4. a = 5, b = 3