Skip navigation
4893 Views 21 Replies Latest reply: Mar 22, 2011 6:57 AM by lvl107
335 posts since
Jan 22, 2007
Currently Being Moderated

## Matrix Number and Solving Equation.

Hello Everyone,

I have a question, wish learning, and really need help. It's about "Matrix Number and Solving Equation."

solve,X.

Thanks in advance for the time and help.

Best regards,

Loi Le.

Attachments:
• 1,278 posts since
Jun 8, 2010
Currently Being Moderated
Mar 15, 2011 11:33 AM (in response to lvl107)
Re: Matrix Number and Solving Equation.

Do you mean like so?

Alan

Attachments:
• 10,404 posts since
May 11, 2010
Currently Being Moderated
Mar 15, 2011 11:34 AM (in response to lvl107)
Re: Matrix Number and Solving Equation.

You solve it much the same way that you solve a simple algebraic equation. The basic rule is that you can perform a manipulation on the left hand side of the equaiotn as long as you perform the same manipulation on the right hand side. The main thing to be aware of is that matrix mulitplication is generally not commutative (i.e. A*B is not equal to B*A). This means there is a distinction between premultiplication and postmultiplication.

If you premultiply the first matrix on the left hand side by it's inverse you get the identity matrix, which is the matrix equivalent of 1. That leaves you, in effect, with only X on the left. So you must also premultiply the matrix on the right hand side by the same matrix (i.e. the inverse of the first matrix on the left hand side). The result is your solution.

• 4,522 posts since
Dec 3, 2008
Currently Being Moderated
Mar 15, 2011 11:53 AM (in response to A.Non)
Re: Matrix Number and Solving Equation.
You solve it much the same way that you solve a simple algebraic equation. The basic rule is that you can perform a manipulation on the left hand side of the equaiotn as long as you perform the same manipulation on the right hand side.

I am being stupid here???

It doesn't have to be multiplication does it. Couldn't the left hand side of the equation be divided by the left hand side matrix to leave X and then do the same on the right hand said?

Mike

#### More Like This

• Retrieving data ...

#### Legend

• Correct Answers - 3 points
• Helpful Answers - 1 points