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iop360
Group Title
Express the inverse of the following matrix (assuming it exists) as a matrix containing expressions in terms of k.
3 0 k
12 8 16
4 2 4
 2 years ago
 2 years ago
iop360 Group Title
Express the inverse of the following matrix (assuming it exists) as a matrix containing expressions in terms of k. 3 0 k 12 8 16 4 2 4
 2 years ago
 2 years ago

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zzr0ck3r Group TitleBest ResponseYou've already chosen the best response.0
um you gave a list of numbers that in no way resembles a matrix
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
\[\left[\begin{matrix}3 & 0 & k \\ 12 & 8 & 16\\ 4 & 2 & 4\end{matrix}\right]^{1}\]
 2 years ago

zzr0ck3r Group TitleBest ResponseYou've already chosen the best response.0
can you reduce it to I?
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
i write where i am write now
 2 years ago

zzr0ck3r Group TitleBest ResponseYou've already chosen the best response.0
k brb wife just got home.
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
this is just the coefficient matrix\[\left[\begin{matrix}1 & 0 & 0 \\ 0 & 1 & 2\\ 0 & 0 & k\end{matrix}\right]\]
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
Use GaussJordan elimination on \[\left[\begin{matrix}3 & 0 & k & 1 & 0 & 0\\ 12 & 8 & 16 & 0 & 1 & 0\\ 4 & 2 & 4 & 0 & 0 & 1\end{matrix}\right]\] That's how I do it. (There's probably an easier way..)
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
yes i started w/ that
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
Hmm, is that 3 in a_11 positive or negative?
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
this is where im at now\[\left[\begin{matrix}1 & 0 & 0 & 0 & \frac{ 1 }{ 4} & 1 \\ 0 & 1 & 2 & 0 & \frac{ 1 }{ 2 } & \frac{ 3 }{ 2 } \\ 0 & 0 & k & 1 & \frac{ 3 }{ 4 } & 3\end{matrix}\right]\]
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
how would i express k on the inverse matrix
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
Continue to reduce it using row operations until you have only the identity matrix on the left.
 2 years ago

iop360 Group TitleBest ResponseYou've already chosen the best response.0
could i multiplay R3 by 1/k?
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
Looks like you have to.
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
The last step ought to be subtracting your new R3 from R2.
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
*Sorry, twice R3 from R2..
 2 years ago
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