My answer is almost correct but not quite and I’m not sure what the grader wants me to fix. Uploading screenshots of two attempts with the errors. (I used -0.5 instead of -1 to try to get rid of that 2 in the error, but that gives the same error showing -0.5 which doesn’t make sense to me…)

Did you try this matrix?

(edited)

If yes, then check whether you used the correct numpy function to find the eigenvectors and eigenvalues.

Yes; using A_reflection_yaxis_eig = (edited)

That’s the correct function, but you’re passing the wrong argument to it.

`# Find eigenvalues and eigenvectors of matrix A_reflection_yaxis.`

You’re finding the eigen’s of the reflection matrix - nothing says to multiply it with A.

Yup that did it, thank you. Most hypothetical question ever!