Description
I am a sophomore in high school and I need help with matrices. The category selection doesn't have geometry, the course I am taking, and I really need help. My teacher didn't explain the material very well, so I am really confused.
Explanation & Answer
Hi, pmonie
Let A =
1 2
3 4
and B =
6 5
7 9
Then the product of C = A * B =
1 * 6 + 2 * 7 1 * 5 + 2 * 9
3 * 6 + 4 * 7 3 * 5 + 4 * 9
which is equal to
20 23
46 51
The short answer is to multiply the ith row times the jth column to get the element in the i,j entry of the product. So, multiplying row 1 of A times column 1 of B gives the element in the 1st row and 1st column of C.
Here are sites that should be helpful: https://www.mathsisfun.com/algebra/matrix-multiplying.html and
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