Obere Dreiecksmatrix/2/R/X^2+3X-4 annulliert/Aufgabe

Bestimme die ${}2\times 2$ -Matrizen über ${}\mathbb {R}$ der Form

{}M={\begin{pmatrix}a&b\\0&d\end{pmatrix}}\,

mit

{}M^{2}+3M-4E_{2}=0\,.

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