Avalie as afirmativas:

Dada a matriz !$ A \, = \, \begin {pmatrix} 1 \,\, 2 \,\, 3 \,\, 4 \\ 0 \,\, 5 \,\, 6 \,\, 7 \\ 0 \,\, 0 \,\, 8 \,\, 9 \\ 0 \,\, 0 \,\, 0 \,\, 10 \end {pmatrix} !$

Item 1 - Se !$ \{ \lambda_1, \, \lambda_2, \, \lambda_3, \, \lambda_4 \} !$ são os autovalores de A, então !$ \sum_{i=1}^4 \, \lambda_i^2 \, = !$ traço !$ (A^2). !$