Theorem 6.1 (The Fundamental Theoremof Algebra by Gauss (1779) Consider a polynomial of degree n in z shownbelow.

Where
∈ℂ. Then,equation (∗) has n solutions
with the property that
for each i=1,…,n. Thisincludes the case in which
for some i≠j.
Exercise Find the eigenvalues and the associatedeigenvectors of the matrices, A and B.

In fact, it is convenient to write the characteristic function as apolynomial in −λ:

The zeros of this characteristic polynomial are precisely the eigenvaluesof A.
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