Question
Use suitable transformation on $\left[\begin{array}{ll}1 & 2 \\ 3 & 4\end{array}\right]$ into an upper triangular matrix.
By $R_2-3 R_1$, we get,
$A \sim\left[\begin{array}{rr}1 & 2 \\ 0 & -2\end{array}\right]$
This is an upper triangular matrix.
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