Question 1176200
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The sum of all eigenvalues of any square matrix  A  is the same as the trace of A (that is, the sum of the diagonal elements of A).



<U>ANSWER</U>.  The sum of the n eigenvalues of A is  -1 + 1 + 2 = 2.
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See this source

https://brilliant.org/discussions/thread/product-and-sum-of-eigenvalues/



Solved, answered and explained.