Question

Matrix help

Answer 1

post the question!?

Answer 2

i know that x y z= (6,4,3)

Answer 3

You have to calculate the inverse of A.

A is some matrix:
\[A = \left[\begin{matrix} ? & ? & ?\\ ? & ? & ? \\ ? & ? & ?\end{matrix}\right]\]satisfying the equation \[A \vec{x} = \vec{b}\].
There are some decent guides on using determinants and co-factors:
http://www.wikihow.com/Inverse-a-3X3-Matrix
https://www.youtube.com/watch?v=pgqyULjZgbU

or using row operations:
http://www.mathsisfun.com/algebra/matrix-inverse-row-operations-gauss-jordan.html
https://www.youtube.com/watch?v=rnyLW2-lL7o

Answer 4

?

Answer 5

From that system of equations you'll get an matrix A. The first assignment is to calculate an inverse of A (A^(-1) is the inverse matrix of A).

Answer 6

OK.

Answer 7

theres no A=[ ]

Answer 8

You get them from the system of equations - like we did yesterday.
x + y + 0z = 10
2x + 0y - z = 9
0x + y - 3z = -5

AX = B
A = matrix
X = vector [x, y, z]
B = vector

The the coefficients in the left side of the equations will go into matrix A and the number on the right side in the equation will go into vector B. Right now we're only interested in matrix A since our first assignments is to calculate A^(-1).

The third row of A is \[A = \left[\begin{matrix} ? & ? & ?\\ ? & ? & ? \\ 0 & 1 & -3 \end{matrix}\right]\]

Answer 9

ok..

Answer 10

Fill the matrix with the correct values and look at the guides I provided you to learn how to compute 3x3 matrix inverse. Also, if you are familiar with row operations I recommend you to look at those first.

Answer 11

@mathslover @Preetha

Answer 12

@OOOPS

Answer 13

Finding the inverse matrix is a nightmare when doing by hand!!!

Answer 14

i see that :(

Answer 15

use calculator to do it, please

Answer 16

2x2 is pice of cake. 3x3 is doable in a few minutes if you do some practice...

Answer 17

i dont know what the matrix is

Answer 18

unbelievable, you solve the problem by matrix method and you don't know what the matrix is, hehehe... fun!!