SOLUTION: Find BA when A = 5 -3 and B= 2 2 -3 2 -2 6 I tried 2*5+2*-3 2*-3+2*2 -2*5+6*-3 -2*-3+6*2 and got 4 2

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Question 1175792: Find BA when A = 5 -3 and B= 2 2
-3 2 -2 6
I tried 2*5+2*-3 2*-3+2*2
-2*5+6*-3 -2*-3+6*2 and got 4 2
-8 18
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52792)   (Show Source): You can put this solution on YOUR website!
.

    B * A =  .  =  = .

Solved.


To see the formula for  2x2-matrices,  look into this  Wikipedia article

https://en.wikipedia.org/wiki/Matrix_multiplication_algorithm



Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Find BA when A = 5 -3 and B= 2 2
-3 2 -2 6
I tried 2*5+2*-3 2*-3+2*2
-2*5+6*-3 -2*-3+6*2 and got 4 2
-8 18
===============================
Find BA when A = 5 -3 and B= 2 2
-3 2 -2 6
-----
| 2  2|   | 5 -3|   |a  b|
|-2  6| * |-3  2| = |c  d|
---

a = 2*5+2*-3 = 4
b = 2*-3+2*2 = -2
c = -2*5+6*-3 = -28
d = -2*-3+6*2 = 18
---
|  4  -2|
|-28  18|

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