Sunday

December 21, 2014

December 21, 2014

Posted by **Katherine** on Tuesday, November 18, 2008 at 6:14pm.

[a -4 -6]

[-8 5 7]

[-5 3 4]

is the inverse of matrix B =

[1 2 -2]

[3 b 1]

[-1 1 -3]

It would really help if you showed how you did it.

Thanks a lot!

- Math -
**Reiny**, Tuesday, November 18, 2008 at 8:23pmI trust you know how to multiply two matrices

and I trust that you know that if you multiply any matrix by its inverse you get the identity matrix, namely

1 0 0

0 1 0

0 0 1

so using the first row of matrix A and the first column of matrix B you get

a - 12 + 6 = 1

a = 7

then second row of A by second column of B gives us

-16 + 5b + 7 = 1

b = 2

**Answer this Question**

**Related Questions**

MATHS----Matrix - For a given square matrix A the predicted values of matrix B ...

math - This is a matrix question. R is the matrix (3r 1) (s 2s) 1. State, in ...

math - This is a matrix question. R is the matrix (3r 1) (s 2s) 1. State, in ...

Calc - A video games shop is analyzing its sales performance using matrices. ...

Math - Fine the size of the following matrix and its additive inverse matrix. ...

Algebra II (Matrices) - My book doesn't solve it like a linear equation, they ...

Math - Let A, B, and 0 be 2x2 matrices. Assuming that A is invertible, find a ...

algebra - When i have a matrix 4 X 4 and i have to multiply it by a 4 X 3 i know...

math,algebra II - I have to work with these types of problems dealing with ...

science - 1 A ……... is a rectangular array of numbers that are ...