anonymous
  • anonymous
Matrix Help!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
anonymous
  • anonymous
what type of math class is this?
anonymous
  • anonymous
It's math team :) But it is Algebra II

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angela210793
  • angela210793
I guess this is what you wanted :) |dw:1343828412416:dw|
anonymous
  • anonymous
Wait, what? o.O I understand what you did when you did the cofactor part, but not after that.
angela210793
  • angela210793
tell me on my drawing wht didnt u understand please
anonymous
  • anonymous
|dw:1343828609211:dw| Also, that wasn't the answer they gave?
anonymous
  • anonymous
Or was that just a part of the process?
angela210793
  • angela210793
just calculations O.o|dw:1343828726092:dw|
anonymous
  • anonymous
How does that work? o.O Sorry, I just haven't done TOO much with matrices yet...
angela210793
  • angela210793
Hmmmm....im sorry i am not sure how to explain you why it is like that....:( it just is like that hmmmm....u can try these...they r pretty good http://www.khanacademy.org/math/algebra/algebra-matrices?k
anonymous
  • anonymous
Well, the final answer is a matrix...can you tell me what topic for matrices to watch? I've watched all of them to the extent of Algebra II material.
angela210793
  • angela210793
Hmmmm....maybe I've misunderstood wht u want to find... hang on a sec
angela210793
  • angela210793
watch inverting matrices
anonymous
  • anonymous
Wouldn't the inverse be \[\left[\begin{matrix}-2 & 1 \\ 4 & 4\end{matrix}\right]\]
anonymous
  • anonymous
Or do I multiply by the reciprocal of the determinant?
angela210793
  • angela210793
tell me smth u want to find the inverse of the |dw:1343829407799:dw|
anonymous
  • anonymous
Would I perform this: \[-\frac1{12}\left[\begin{matrix}-2 & 1 \\ 4 & 4\end{matrix}\right]\]
anonymous
  • anonymous
Yes. I want to find the inverse of what's above in your picture.
angela210793
  • angela210793
learnt this At Khan's videos so jusat plug in the numbers now |dw:1343829481250:dw|
angela210793
  • angela210793
or read this...is very well explained http://dcann.myweb.uga.edu/lect08add.pdf
anonymous
  • anonymous
Isn't that what I did above? |dw:1343829681330:dw|
angela210793
  • angela210793
yup :)
anonymous
  • anonymous
Alright, so the answer would be: \[\left[\begin{matrix}\frac16 & -\frac1{12} \\ -\frac13 & -\frac13\end{matrix}\right]\]
angela210793
  • angela210793
shouldnt it be |dw:1343830119553:dw|
anonymous
  • anonymous
Is there supposed to an aboslute value on the A? not sure...I thought that a and d switched places and that b and c negated...maybe I'm wrong?
angela210793
  • angela210793
no abs value
anonymous
  • anonymous
So it would be correct what I did?
angela210793
  • angela210793
hang on a sec pls...im on the phone
angela210793
  • angela210793
i said so...from the second link i sent u
anonymous
  • anonymous
Wait. Let me check the link...
angela210793
  • angela210793
oh wait ...-_-
anonymous
  • anonymous
I have not gone that far into matrices quite yet...haven't learned to transpose... -_-
angela210793
  • angela210793
it was as u said...sorry...it's too hot in here -_-'' I'm not thinking well :p |dw:1343830633083:dw|
anonymous
  • anonymous
lol ok. Thanks :)
angela210793
  • angela210793
|dw:1343830704511:dw|

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