Linear AlgebraSuperchallengeEigenvalues ShareEigenvalues · Superchallenge problemA real 4×44\times44×4 matrix AAA satisfies A2+A+I=0A^2 + A + I = 0A2+A+I=0. Find trA\operatorname{tr}AtrA.Check Show answer Walk through it step by step Practice more like this Review this concept