March 5th, 2010, 03:31 PM  #1  
Newbie Joined: Mar 2010 Posts: 5 Thanks: 0  Matrice Assistance
Hello I am trying to understand what this question is asking of me in matrices & what is the format I should give the answer in: Quote:
a. I do this: Quote:
But I give my answer by creating a new matrice called D where I have D = 2A3B+4C Quote:
For b. I am unsure of what the question is asking me? Do I have to show that (A*B)*C == A*(B*C)? So I must create a Matrice D which = (AB)C & a matrice E which = A(BC) & show that D == E? Am I on the right track or way off? Can you clarify how to multiply 2 matrices? If i have to multiply A*B do I do this... Quote:
 
March 5th, 2010, 05:26 PM  #2 
Senior Member Joined: Apr 2008 Posts: 435 Thanks: 0  Re: Matrice Assistance
Your first part is correct. To check if AB*C = A*BC, multiply them out in the order indicated. Your formula for matrix multiplication is not correct. I recommend http://en.wikipedia.org/wiki/Matrix_(mathematics) for a very quick summary of matrix multiplication, despite the source. Sufficient? 

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