This week we did a test on matrices and we learned 12-1. We also worked on aleks a lot, which is good because its pretty easy and will help bring up everyone's grades in that class. I forgot how to do 12-1 and i forgot to bring my binder home, so i will go over matrices :)
Adding and subtracting matrices is pretty straightforward. you just add or subtract the number across from it in each matrix.
Ex:
[2 3] + [7 5] = [9 8]
[1 5] [1 0] [2 5]
When you multiply matrices, you must make sure the dimensions are correct. if you have a 3x2 matrix and a 2x1 matrix, you can multiply this because the two middle numbers (2 and 2) are the same.
Ex:
[2 3] x [7 5]= [14+ 3 10+0]= [17 10]
[1 5] [1 0] [7+5 5+0] [12 5]
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