Matrices!

Woaaaah, feels like I haven’t done one of these in forever!
We started Chapter 14 this week and it’s all about MATRICES! I’m not really sure how I’m going to type them out so bare with me. You can add and subtract matrices but they have to be the same dimensions. Another thing we learned was how to multiply them. When doing so, you have to have the same number of columns in the 1st one and rows in the 2nd one. We also learned how to find its inverse.

Rows – go across
Columns – up and down

Adding and subtracting matrices is simple..
EXAMPLE 1: [-5 0 + [6 -3
4 1] 2 3]
A). To add matrices, we add the corresponding members. Subtraction is done in the same way.
B). (-5+6) (0-3)
(4+2) (1+3)
C). [1 -3
6 4]
D). Your new matrix is a 2 x 2.

EXAMPLE 2: 3[-3 0
4 5]
A). Multiply each number of the matrix by 3, easy.
B). [-9 0
12 15]

When adding, subtracting, and multiplying matrices be careful of negatives! This blog is nasty looking because of those stupid brackets :/