1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Inverse Matrices Problem

  1. Jun 27, 2011 #1
    Hi :smile:

    I don't really know how to post a matrix here so I will try and make it as clear as possible.

    Matrix A: 4 -1
    2 3

    Matrix B: 6 4
    -5 -3

    Matrix C: 1 2
    3 4

    We are given that APB = C and we are asked for P

    What I did was I multiplied both sides by the inverse of (A*B), hence:

    P = (A*B)-1 * C

    I got a different answer than the book however, could anyone check?

    My answer:
    1.85 1.95
    2.85 2.95

    Book:

    1.6 1.8
    2.9 3.2

    Thanks,
    Peter G.
     
  2. jcsd
  3. Jun 27, 2011 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Hi Peter,

    Matrix multiplication is not commutative!

    Multiply on the left by A-1 and on the right by B-1.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Inverse Matrices Problem
  1. Inverses of matrices (Replies: 2)

Loading...