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Math Help - Show that a matrix ISNT invertible?

  1. #1
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    Show that a matrix ISNT invertible?

    So matrix A is

    1 2 1 0
    3 1 2 3
    2 5 0 1
    2 -1 1 3

    how will i go able showing that this matrix ISNT invertible?
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  2. #2
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    Re: Show that a matrix ISNT invertible?

    Quote Originally Posted by Brennox View Post
    So matrix A is

    1 2 1 0
    3 1 2 3
    2 5 0 1
    2 -1 1 3

    how will i go able showing that this matrix ISNT invertible?
    A square matrix \displaystyle \begin{align*} \mathbf{A} \end{align*} is only invertible if \displaystyle \begin{align*} |\mathbf{A}| \neq 0 \end{align*}, so to show that this matrix is NOT invertible, evaluate \displaystyle \begin{align*} |\mathbf{A}| \end{align*} and show that it equals 0.
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    Re: Show that a matrix ISNT invertible?

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