1. ## Find coefficients

Find coefficients a1,a2 and a3 such that (1 2 1) = a1V1 + a2V2 + a3V3.

2. Hello, al1850!

No one is responding because we can't read the problem.
Obviously, there's a typo . . . and it still doesn't make sense.

Find coefficients a1,a2 and a3 such that (1 2 1) = a1V1 + a2V2 + a3V3 . ?

$A \;=\;\begin{bmatrix}\frac{1}{\sqrt{2}} & -\frac{1}{\sqrt{2}} & 0 \\ \frac{1}{\sqrt{2}} & -\frac{1}{\sqrt{2}} & 0 \\ 0 & 0 & 1\end{bmatrix} \;=\;\begin{bmatrix}v1 & v2 & v3\end{bmatrix}$ . ??

I would guess that the "coefficients": $a_1,a_2,a_3$ belong to $A$ (somehow).

But $a_1v_1 + a_2v_2 + a_3v_3$ is a constant.
. . It can not equal a matrix: $\begin{bmatrix} 1 & 2 & 1\end{bmatrix}$

Please state the original problem . . . carefully.

3. Hi,

Maybe this is the same as here : http://www.mathhelpforum.com/math-he...-question.html

4. That's exactly how it is asked in a Maths assignment.
I used r.e.f work out that a1=3√2/2 , a2=√2/2 , a3=1
Not sure if thats the coefficients.