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becca18

  • 3 years ago

Find the determinant of the following: |3 -3| |-1 2|

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  1. jadiemint
    • 3 years ago
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    is this one matrices? or two

  2. becca18
    • 3 years ago
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    Just matrix. one

  3. jadiemint
    • 3 years ago
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    ok. then the determinent is 1/(ad-bc), where a is top left, b is top right, c is bottom left and d is bottom right. that help?

  4. becca18
    • 3 years ago
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    Not really. Whats the answer?

  5. jadiemint
    • 3 years ago
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    I got 1/3. is that what you got?

  6. becca18
    • 3 years ago
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    No this is what I got, |dw:1320713982160:dw| And I just looked at my notes and its not matrix I don't think.

  7. jadiemint
    • 3 years ago
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    Oh, you're right, sorry my mistake :) I was going one step further towards finding the inverse lol your answer's right!

  8. becca18
    • 3 years ago
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    I'm confused because we learned how to do it this way last week but now we're doing Matrix and it looks the same and the direstions don't tell me anything

  9. becca18
    • 3 years ago
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    Thank You! Btw I think it's Called Cramers rule(:

  10. jadiemint
    • 3 years ago
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    oooh ok thanks :D lol

  11. Zarkon
    • 3 years ago
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    Cramer's rule is a way to use determinants to solve some systems of equations. if \[A=\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\] then \[|A|=ad-bc\] always

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