SOLUTION: Please help me find the inverse of: 3 -1 -2 1 All in brackets! If it exists! Thank you, Ray

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Question 149909: Please help me find the inverse of:
3 -1
-2 1
All in brackets! If it exists!
Thank you, Ray
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
See this http://mathworld.wolfram.com/MatrixInverse.html
Find the inverse of
matrix%282%2C2%2C+3%2C-1%2C+-2%2C1%29
Using the formula in the link above, find 1%2F%28ad-bc%29
1%2F%283%2A%281%29-+%28-2%29%2A%28-1%29%29
1
So the inverse matrix is
matrix%282%2C+2%2C+1%2C1%2C+2%2C3%29
Verify your result by multiplying the given matrix by the inverse and showing the result is the identity matrix
matrix%282%2C2%2C+1%2C0%2C0%2C1%29