Diagonalize $$$\left[\begin{array}{cc}t & - t\\0 & t\end{array}\right]$$$
Your Input
Diagonalize $$$\left[\begin{array}{cc}t & - t\\0 & t\end{array}\right]$$$.
Solution
First, find the eigenvalues and eigenvectors (for steps, see eigenvalues and eigenvectors calculator).
Eigenvalue: $$$t$$$, eigenvector: $$$\left[\begin{array}{c}1\\0\end{array}\right]$$$.
Since the number of the eigenvectors is less than the dimension of the matrix, the matrix is not diagonalizable.
Answer
The matrix is not diagonalizable.
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