Question

can someone help me with matrices?

Answer 1

Hey Rld!

Answer 2

Like how do I find and inverse of a matrix using the product of elementary matrices

Answer 3

Hey mhp :D

Answer 4

I need to find the inverse of a matrix using elementary matrices What doe sthat mean?

Answer 5

The inverse of a given matrix is a matrix, which when multiplied with the given matrix gives identity.

Answer 6

there is something called a cofactor matrix, that is tranposed and then divided out by the determinate of the original

Answer 7

no I need to use the product of the elemntary matrices idk

Answer 8

youll have to define what that is

Answer 9

LOL It tells me to find the inverse of a amtrix using elementary matrices

Answer 10

What do u think that means?

Answer 11

if i copy from a book

if AB=BA = I

Answer 12

theres more to it though

Answer 13

\begin{pmatrix}a&b&c\\e&f&g\\h&j&k\end{pmatrix}
\begin{pmatrix}+|\begin{array}c f&g\\j&k\end{array}|\end{pmatrix}
cant tell if that formats

Answer 14

can u guys plz help me with my question?

Answer 15

\[\begin{pmatrix}+|\begin{array}c f&g\\j&k\end{array}|&
-|\begin{array}c e&g\\h&k\end{array}|&
+|\begin{array}c e&f\\h&j\end{array}|\\

-|\begin{array}c b&c\\j&k\end{array}|&
+|\begin{array}c a&c\\h&k\end{array}|&
-|\begin{array}c a&b\\h&j\end{array}|\\

+|\begin{array}c b&c\\f&g\end{array}|&
-|\begin{array}c a&c\\e&g\end{array}|&
+|\begin{array}c a&b\\e&f\end{array}|\\
\end{pmatrix}^T\frac{1}{det}=inverse\]

those sub matrixes are the determinants values of those things

Answer 16

dunno if its what its calling for tho :/

Answer 17

those are not elementary matrices

Answer 18

noooo they want something simple but obviously they didnt show an example and like i cant figure it out

Answer 19

here is an example ... http://stattrek.com/matrix-algebra/how-to-find-inverse.aspx

Answer 20

bummer, i memorized it for naught lol

Answer 21

Thanks amistre lol

Answer 22

isnt that the gauss jordon?

Answer 23

Ya s/t like that LOL

Answer 24

Zarkon that is what I needed

Answer 25

Thanks Guys :DDDD

Answer 26

ty zarkon

Answer 27

i didnt have to type the rst of the stuff

Answer 28

lol didnt forget abt yesterday mth. Do u still need help?

Answer 29

im just getting it from the book :P

Answer 30

hmmm

correct me if i am wrong

on a coordinate plane the sine and cosine waves

to find their angle measurement would it just be the same same way
as finding them in a regular circle

then to find their line measure

how to do that

if it was just plot right in the middle of a coordinate plane

Answer 31

This is how u wld draw it