.. _AQweek11:

Week 11 Attendance Quiz Hints
-----------------------------

**AQ08_1:**

#. See :ref:`eigIntro`. This is true for a rotation matrix; but recall
   that for other matrices, it is only for the eigenvectors that rotation
   does not occur.

#. See :ref:`eigIntro`.

#. See :ref:`eigIntro`.

**AQ08_3:**

#. See :ref:`find-eigvals`.

#. Look for the notes about eigenvectors being invariant to scale in
   :ref:`eigProperties`.

#. Use the simple equation in :ref:`find-eigvals` to find the eigenvalues of
   a :math:`2{\times}2` matrix. Then find the two characteristic equations.

#. See :ref:`eigroots`.