Math Is Fun Forum

gftrigo

Member

Registered: 2011-03-17

Posts: 7

Algebra problem!

Hi!

I have this algebra problem that has been puzzling me.

I have this matrix multiplication:

where A and theta are a 3x3 matrix and a 3x1 vector, respectively, both dependent of x and D and S are 3x3 constant matrices.
A is a symmetric matrix, D is a diagonal matrix and S is a skew-symmetric matrix.
I need to arrange this into the form:

where C is a constant matrix and F(x) is a vector function of x. The dimensions of these matrix and vector are not important, as long as the result of the multiplication is 3x1.
I need to isolate the x dependent part on the right side of the term in order to apply a control algorithm.

Does anyone know how to do this?

Thanks!

Dragonshade

Member

Registered: 2008-01-16

Posts: 147

Re: Algebra problem!

never mind. I got it wrong : (

Last edited by Dragonshade (2011-03-31 20:13:41)

2luv4everel@gmail.com

Member

Registered: 2011-04-05

Posts: 1

Re: Algebra problem!

2y - y - =15
x+2y=45

help me

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Algebra problem!

Hi 2luv4everel@gmail.com;

Welcome to the forum!

Now substitute into the second equation.

Subtract 30 from both sides.

So x = 15 and y = 15

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