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December 6th, 2010, 02:52 PM  #1 
Newbie Joined: Dec 2010 Posts: 5 Thanks: 0  Help with Matrix problem
I do not now how to do these types of problems. Could somebody point me in the right direction? Find the matrix A such that A[ 1 0 ] = [ 5 4] [ 1 4] = [ 7 12] hint: let A = [a b] [c d] 
December 6th, 2010, 03:20 PM  #2 
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: Help with Matrix problem
Do you know how to do matrix multiplication? Set this equal to the given matrix, then solve by setting corresponding elements equal to each other. 
December 6th, 2010, 03:33 PM  #3  
Newbie Joined: Dec 2010 Posts: 5 Thanks: 0  Re: Help with Matrix problem Quote:
I get to here: Then: In equation form is a = 5 b= 4 a + 4c = 7 b +4d = 12 Solving for c and d gives a = 5 b = 4 c = .5 d = d = 2 Is this correct? I am new to this, just trying to figure it out by following along in a book.  
December 6th, 2010, 03:51 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,923 Thanks: 1123 Math Focus: Elementary mathematics and beyond  Re: Help with Matrix problem
4b = 4 a  b = 5 4d = 12 c  d = 7 
December 6th, 2010, 04:10 PM  #5  
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: Help with Matrix problem Quote:
Compare the matrices in my reply with the statements in greg1313's post  
December 6th, 2010, 04:11 PM  #6  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Help with Matrix problem Hello, littlebu! It would help if you didn't scatter your work . . . Quote:
[color=beige]. . . . . . . . . . . [/color]  
December 6th, 2010, 05:13 PM  #7 
Newbie Joined: Dec 2010 Posts: 5 Thanks: 0  Re: Help with Matrix problem
Thanks for the replies everyone, this is really helpful and makes sense now. This forum is fantastic, it is hard to "teach" yourself from a book when you don't know what to do, thanks again for the help I have a feeling I am going to be asking a lot of questions here. Hope you all don't get annoyed with me lol.


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