anonymous
  • anonymous
what is the solution of the matrix ?
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
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xapproachesinfinity
  • xapproachesinfinity
do you have to do it with matrices?
anonymous
  • anonymous
um i think soo , would you do this the same way you would do it if it was addtion ?if that makes sense

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anonymous
  • anonymous
addition *
anonymous
  • anonymous
ill show you what im talking about
anonymous
  • anonymous
this is what i am talking about would i do it the same but just multiply ?
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xapproachesinfinity
  • xapproachesinfinity
not really getting your point inverse of 2x2 matrix can be computed like this |dw:1433291928663:dw|
xapproachesinfinity
  • xapproachesinfinity
i see your point, you need inverse and them multiplciation operation of matrices there is not addition here
perl
  • perl
$$\Large {A}\mathbf{ x} = \mathbf{b} \\ \Large \mathbf{ x} = A^{-1} \mathbf{b}$$
anonymous
  • anonymous
I know ...... :(((((
xapproachesinfinity
  • xapproachesinfinity
try to find the determinant first
anonymous
  • anonymous
now how would i find that , i usually use a online matrix calculator to find the determinant so i wouldn't know how to find on my own
xapproachesinfinity
  • xapproachesinfinity
ok the determinant is computed like this |dw:1433292400098:dw|
anonymous
  • anonymous
ok
xapproachesinfinity
  • xapproachesinfinity
you multiply ad and bc and then subtract
anonymous
  • anonymous
ok thats all ?
xapproachesinfinity
  • xapproachesinfinity
do the same with your matrix
xapproachesinfinity
  • xapproachesinfinity
no not finished that's only how to do determinant
anonymous
  • anonymous
ok im writing this down
xapproachesinfinity
  • xapproachesinfinity
ok
anonymous
  • anonymous
cross multiply ?
xapproachesinfinity
  • xapproachesinfinity
yeah seems like cross multiply then take the difference
anonymous
  • anonymous
so for me it would me 9*1 &4*2 for A and for X it would be -9*-8 and -6 *-1 right?
anonymous
  • anonymous
or did you mean multiply A with X ???
xapproachesinfinity
  • xapproachesinfinity
so here \[A=\begin{bmatrix}9&4\\ 2&1\end{bmatrix}\] \[\det(A)=9(1)-2(4)=9-8=1\]
xapproachesinfinity
  • xapproachesinfinity
oh no what are you taling about? are you following what i'm saying haha
anonymous
  • anonymous
yeah
anonymous
  • anonymous
9*1 i did that 2*4 i did that too
xapproachesinfinity
  • xapproachesinfinity
we are looking for X and i used what perl did X=Ainverse times B
anonymous
  • anonymous
i know what i did wrong i forgot to subtract ..
xapproachesinfinity
  • xapproachesinfinity
it was AX=B then we multiplied A^-1 and we got X=A^{-1}B now we are in the process of computing A inverse that is why we need determinant of A
xapproachesinfinity
  • xapproachesinfinity
no seems you missed the whole poiint from what i understand from your last reply
anonymous
  • anonymous
no .. i didn't you said cross multiply then subtract right ???
xapproachesinfinity
  • xapproachesinfinity
that's only for determinant
xapproachesinfinity
  • xapproachesinfinity
i did that for you already see my replay above
xapproachesinfinity
  • xapproachesinfinity
\(\color{blue}{\text{Originally Posted by}}\) @xapproachesinfinity so here \[A=\begin{bmatrix}9&4\\ 2&1\end{bmatrix}\] \[\det(A)=9(1)-2(4)=9-8=1\] \(\color{blue}{\text{End of Quote}}\)
anonymous
  • anonymous
ok so what do have to do next then ?
anonymous
  • anonymous
find x ?
xapproachesinfinity
  • xapproachesinfinity
|dw:1433293368759:dw|
anonymous
  • anonymous
yup
xapproachesinfinity
  • xapproachesinfinity
so we do 1/det A so 1/1 =1 here we didn't need to worrt about it since it is just 1
anonymous
  • anonymous
ok
xapproachesinfinity
  • xapproachesinfinity
next step is to do a switch|dw:1433293517899:dw|
xapproachesinfinity
  • xapproachesinfinity
you take A and switch a and d b and no switch you just change the sign
anonymous
  • anonymous
ok i get that but where do the negatives come from
xapproachesinfinity
  • xapproachesinfinity
it is a rule you need to read about it on your notes
xapproachesinfinity
  • xapproachesinfinity
what kind of class are taking
anonymous
  • anonymous
algebra 2
xapproachesinfinity
  • xapproachesinfinity
hmm really? i don't really know how much you know about matrices
xapproachesinfinity
  • xapproachesinfinity
hmm this really needs some time to get accustomed to! it may be fairly easy, but needs a lot of practice you might want to look at some video tutorial on youtube
anonymous
  • anonymous
okay , i will
xapproachesinfinity
  • xapproachesinfinity
once you feel comfortable then tackle problem it is no helping to do problem you are not ready to do be real, no matter how much i explain to you here, you will need the lecture first here open study will not give you the lecture rather help assist you with difficulties you are having after knowing the lecture and know fairly enough on the subject
xapproachesinfinity
  • xapproachesinfinity
i will do your problem now, but next problem you need to try your hardest :)
anonymous
  • anonymous
okay
xapproachesinfinity
  • xapproachesinfinity
let me do it on paper ans take a picture
anonymous
  • anonymous
ok
xapproachesinfinity
  • xapproachesinfinity
almost hehe
anonymous
  • anonymous
kay
xapproachesinfinity
  • xapproachesinfinity
xapproachesinfinity
  • xapproachesinfinity
before the last line i preformed matrix multiplication
xapproachesinfinity
  • xapproachesinfinity
is it readable ?
anonymous
  • anonymous
yeah it is . -5 ,26 -9 and -60 correct right
xapproachesinfinity
  • xapproachesinfinity
there is no -9
anonymous
  • anonymous
oh ,
xapproachesinfinity
  • xapproachesinfinity
that's just brackets
xapproachesinfinity
  • xapproachesinfinity
that should match C
anonymous
  • anonymous
oh , my bad it looked like a negative for a second but yes it is C
xapproachesinfinity
  • xapproachesinfinity
okay
xapproachesinfinity
  • xapproachesinfinity
hope that helps
anonymous
  • anonymous
it does ,,,,, THANKS ..
xapproachesinfinity
  • xapproachesinfinity
my pleasure

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