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 .?

.??

I would guess that the "coefficients": belong to (somehow).

But is aconstant.

. . It cannotequal a matrix:

Please state the original problem . . . carefully.