# Matix mulitiplication

1. Oct 18, 2009

### morbello

wow what a day.ive got an a,b,c,d matrix mulitiplyed by an a,b,c,d.matrix and i want to know what combination off a's and b's gives the answer to the 2*2 * 2*2 question.

ive read its a1 *a2 b1*b2 c1*c2 d1*d2 is this right as when ive done it i have got a sum that is wrong.

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Oct 18, 2009

### morbello

sorry its a composit linear transformation im looking for.

3. Oct 18, 2009

### Staff: Mentor

When you submit a question it should follow this format:
1. The problem statement, all variables and given/known data
What exactly is the problem you're trying to solve? Saying that you have "an a,b,c,d matrix mulitiplyed by an a,b,c,d.matrix and i want to know what combination off a's and b's gives the answer to the 2*2 * 2*2 question" is not a problem statement that anyone can do anything helpful with.
2. Relevant equations

3. The attempt at a solution
Show us what you have tried to do.

4. Oct 18, 2009

### morbello

ok sorry im not sure how to get the symbols on the screen will try again tommorow.

5. Oct 18, 2009

### Staff: Mentor

Try these. Click on either one to see the LaTeX script I used. You can copy and paste the script into your post.

$$\left[ \begin{array}{c c} a_1 & b_1 \\ c_1 & d_1 \end{array}\right ]$$

Here's another.

$$\left[ \begin{array}{c c} a_2 & b_2 \\ c_2 & d_2 \end{array}\right ]$$