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becca18

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

  • 2 years ago
  • 2 years ago

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  1. jadiemint
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    is this one matrices? or two

    • 2 years ago
  2. becca18
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    Just matrix. one

    • 2 years ago
  3. jadiemint
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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?

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

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

    • 2 years ago
  6. becca18
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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.

    • 2 years ago
  7. jadiemint
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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!

    • 2 years ago
  8. becca18
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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

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

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

    • 2 years ago
  11. Zarkon
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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

    • 2 years ago
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