Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
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
 one year ago
 one year 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
 one year ago
 one year ago

This Question is Closed

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
 one year ago

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

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

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

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

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

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

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

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

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

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

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

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

CliffSedge Group TitleBest ResponseYou've already chosen the best response.2
*Sorry, twice R3 from R2..
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.