My BF's son is having problems in algebra. I have volunteered to help,because I used to be pretty good at it..

Question

I haven't looked at what he's doing yet but he tells me he is working on matrix and inversions......Can anyone give me a quick refresher on this? He's a senior in high school.
Thanks!

Answer 1

when i did matrices last year we used a graphing calculator. There was also this way to do it by hand, but trust me it was confusing. i'd read over the notes he took and look at his math book.

Answer 2

I suggest you read his book to see specifics, however, a short refresher would be the following. A matrix is a group of numbers arranged as follows:

2 5 5
1 3 3
9 3 5

Now, to add two of those together, you will have to add numbers in the same position.

For instance a matrix as follows:

1 2
3 4

Added to another matrix like that:

1 2
3 4

Will result in solving as follows (1+1) (2+2) etc

And the resulting matrix would be:

2 4
6 8


There are other rules to multiply matrices.

Inversion in mathematics means the opposite. In terms of matrices (which I think your BF's son is referring) this would be in the form of 1/[A] where [A] would represent the matrix.

As I said, I suggest a little reading to help.

Regards,

Mysstere

Answer 3

Inverse of the matrix [A] exist only when 'A' is a square matrix and lAl is not equal to zero.
A' (Aij inverse)= Aji/lAl
Aji is the algebraic complement of the matrix Aij

Answer 4

matrix A and B

B is the inverse of A if and only if

A*B = identity matrix

Answer 5

read the text book.

Answer 6

check this site out
http://hotmath.com/index.html

Answer 7

never heard of any of that....In english maybe??