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Anita505
 2 years ago
Find the inverse of the following matrix A, if possible. Check that...
WILL GIVE A MEDAL :)
Anita505
 2 years ago
Find the inverse of the following matrix A, if possible. Check that... WILL GIVE A MEDAL :)

This Question is Closed

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

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1If 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.

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0sorry we are not suppose to use a graphing calculator actually.

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1In this case, you might have to give us the matrix A in order to start...

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

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

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1Also, 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.

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0section 4.5 The Gauss Jordan method for calculating Inverses.

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1Okay. Please tell me what matrix A is. I mean, the four numbers...

RadEn
 2 years ago
Best ResponseYou've already chosen the best response.0lol, @Anita505 can u draw ur matrix according in ur book :)

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0oh yes haha sorry about that. :p

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1Begin 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?

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0on the bottom left corner

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1Yes. 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

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

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1I'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?

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0okay 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

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

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

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1Tell me what your answer is :)

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.16 021/16 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 :)

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0so 15 I 16 3 I 16 is what u got?

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1No... the correct matrix is 7/32 5/32 1/16 3/16

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0ohh okay they are in fractions oh okay thank you!

inkyvoyd
 2 years ago
Best ResponseYou've already chosen the best response.1yes, my bad http://www.bluebit.gr/matrixcalculator/calculate.aspx

Anita505
 2 years ago
Best ResponseYou've already chosen the best response.0thank you can u help me with a few more questions?
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