Here’s my answer for the practice question.
I hope i can get it right :O
Final Matrix Answer : 1 by 2
( 8+3 -12+0 ) => ( 11 -12 )

I’m glad that my videos will motivate you to create your own. This is definitely benefits more students.

I use Camtasia software for video-capturing.

but hor… it will be better if
1. ya elements are all different in both matrices. If I didn’t remember wrongly, there are two element “1″s, one in each matrix;
2. highlight the row and column u are multiplying to get the element in the product. e.g. Highlight row1 and column2 when working on the R1C2 element.

Your videos always inspire me to make my own. but too lazy and tired. guess time and energy are the luxuries school teachers don’t have.

btw, just pluck in the mic and use with the software u told me and can capture sound n “movement” on the Tablet PC?