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Practicing Success
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Which of the following matrices is not invertible ? |
$\begin{bmatrix}1 & 1\\0 & 1\end{bmatrix}$ $\begin{bmatrix}2 & 3\\4 & 6\end{bmatrix}$ $\begin{bmatrix}-1 & -1\\-1 & 5\end{bmatrix}$ $\begin{bmatrix}2 & -2\\1 & 1\end{bmatrix}$ |
$\begin{bmatrix}2 & 3\\4 & 6\end{bmatrix}$ |
$\begin{bmatrix}2 & 3\\4 & 6\end{bmatrix}=2×6-3×4$ $Δ=0$ Not invertible |
