# matrices

• Sep 24th 2010, 01:38 PM
Oasis1993
matrices
• Sep 24th 2010, 06:36 PM
Prove It
$\displaystyle M = \left[\begin{matrix}a&b&c\\d&e&f\\g&h&j\end{matrix}\righ t]$.

You know $\displaystyle M\mathbf{p} = \mathbf{q}, M\mathbf{q} = -2\mathbf{r}, M\mathbf{r} = 2\mathbf{p}+ 4\mathbf{q}$.

So perform these multiplications to give you a set of equations to solve for $\displaystyle a,b,c,d,e,f,g,h,j$.
• Sep 25th 2010, 02:29 AM
mr fantastic
Quote:

Originally Posted by Oasis1993

As a simple courtesy to the people you are asking for help, please type out questions like this rather than attaching a file. It doesn't take much time and shows you are willing to make some small effort in order to get help.
• Sep 26th 2010, 06:54 AM
Oasis1993
On the contrary, i thought it would be easier and clearer if i attached it as a file.. i'll make sure to type it out next time.

If you are willing to help...I managed to find Matrix M as ( -1 3 1 )
0 4 2
1 -1 1

However for the second part M-1p i keep getting ( 1 ) .. which is wrong..
-5/8
0