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Anita505
Group Title
Find the inverse of the following matrix A, if possible. Check that...
WILL GIVE A MEDAL :)
 one year ago
 one year ago
Anita505 Group Title
Find the inverse of the following matrix A, if possible. Check that... WILL GIVE A MEDAL :)
 one year ago
 one year ago

This Question is Closed

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
The question is, will you give your calculator a medal if you did the same thing? ;)
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
If you own a graphing calculator, chances are you will be able to use it to do this math problem. I'm assuming that this is NOT homework OR testwork. If it is, I'll try to work you through the problem.
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
dw:1363038798101:dw
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
sorry we are not suppose to use a graphing calculator actually.
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
@SithsAndGiggles
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
In this case, you might have to give us the matrix A in order to start...
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
can u show me the steps on finding this solution? please i dont understand what i did wrong
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Well, you might want to type the A matrix because I can't find the inverse of the matrix without the matrix itself xD
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.0
dw:1363039261135:dw
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Also, please tell me the name of the unit/course you are taking at the moment. There are a number of ways to find the inverse of a matrix. I'm assuming you are using determinants or GaussJordan elimination, but if you are using something else please let me know.
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
section 4.5 The Gauss Jordan method for calculating Inverses.
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Okay. Please tell me what matrix A is. I mean, the four numbers...
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.0
lol, @Anita505 can u draw ur matrix according in ur book :)
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
oh yes haha sorry about that. :p
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
dw:1363039743929:dw
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Begin with your matrix and the identity matrix. Now, you want to make the left hand side the identity matrix, and the right hand side will be the inverse. Use elementary row operations. 6 51 0 2 70 1 Let's multiply the second row by 3, so that first number is also 6 6 5 1 0 6 210 3 Now subtract the first row from the second row REMEMBER: We want the left hand side to be the identity matrix! 6 5 1 0 0 161 3 The zero in the bottom left is a start  we want to keep going. What do you think we should do next?
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
we want to get a 1
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
on the bottom left corner
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
oops right**
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Yes. so we simply divide the that bottom row by 16. 6 5 1 0 0 11/16 3/16 Next we'll find the top row by subtracting 5 times the second row 6 021/16 15/16 0 11/16 3/16 finally divide row one by 6. I'ma check my work to see if I got it correct xD  tell me what you got xD
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
@inkyvoyd can you please draw out the matrix solution? this is very confusing.. to understand ahah
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
I'm afraid I can't do that  what I will do is tell you if what you get agrees with what I get. Is that fair?
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
okay so what did u get for the first row and first column, first row and second column, and what did u get for the second row first column and second row second column
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
dw:1363062987282:dw
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Can you tell me what you got, so I can check your answer? :)
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
my answer is incorrect tho thats why i asked u to show me what u did :p
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
Tell me what your answer is :)
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
1 I 3 0 I 1
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
6 021/16 15/16 0 11/16 3/16 this is where I left off. This is only one step left  use a single easy elementary operation to make the left hand the identity matrix. and the right hand will be your answer :)
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
so 15 I 16 3 I 16 is what u got?
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
No... the correct matrix is 7/32 5/32 1/16 3/16
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
ohh okay they are in fractions oh okay thank you!
 one year ago

inkyvoyd Group TitleBest ResponseYou've already chosen the best response.1
yes, my bad http://www.bluebit.gr/matrixcalculator/calculate.aspx
 one year ago

Anita505 Group TitleBest ResponseYou've already chosen the best response.0
thank you can u help me with a few more questions?
 one year ago
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