Question

Find the inverse for the matrix, if it exists.
|1 1 1|
|2 1 1|
|2 2 3|

Answer 1

put it against the identity matrix and try to convert it into the identity matrix.....

Answer 2

[1 1 1 | 1 0 0]
[2 1 1 | 0 1 0]
[2 2 3 | 0 0 1]

Answer 3

the rest of it looks like a mystery lol

Answer 4

for real ? OMG it's my midterm :(

Answer 5

give me a minute to review this ;)

Answer 6

[1 1 1 ] [a b c] [1 0 0]
[2 1 1 ] * [d e f] = [ 0 1 0] if anything else
[2 2 3 ] [g h i] [0 0 1]

Answer 7

let me try this;:

[1 0 0]
[2 -1 -1] let me try that as the inverse...
[-2 0 1]

Answer 8

......not quite seeing it here..

Answer 9

the matrix inverter says its:

[-1 1 0]
[4 -1-1]
[-2 0 1]

Answer 10

http://www.math.ubc.ca/~israel/applet/mcalc/matcalc.html