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Thread: compute det A

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    Super Member bigwave's Avatar
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    compute det A

    compute det A-capture-_2018-03-30-12-35-23.png
    what is $(-1)^1$
    and $(-1)^0$ ?
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    Super Member bigwave's Avatar
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    Re: compute det A

    not sure if image clear
    it was in preview
    Thanks from topsquark
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    Re: compute det A

    Quote Originally Posted by bigwave View Post
    not sure if image clear
    it was in preview
    Anyone in her/his right mind would expand along the third row:
    $2\left| {\begin{array}{*{20}{c}} 1&0 \\ 2&{ - 1} \end{array}} \right|$

    See here.
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    Forum Admin topsquark's Avatar
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    Re: compute det A

    Quote Originally Posted by bigwave View Post
    Click image for larger version. 

Name:	Capture+_2018-03-30-12-35-23.png 
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    what is $(-1)^1$
    and $(-1)^0$ ?
    The first example has a (-1)^1 included because the 2nd and 3rd rows were interchanged. The second example didn't move the rows around.

    -Dan
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    Re: compute det A

    Quote Originally Posted by bigwave View Post
    what is $(-1)^1$
    and $(-1)^0$ ?
    Any number, a, to the power 1 is itself, a. Any number, other than 0, to the power 0 is 1.

    so $(-1)^1= -1$ and $(-1)^0= 1$.
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