The transformation is represented by the matrixA, whereA=

(1) Find the eigenvectors ofA.

(2) Find an orthogonal matrixPand a diagonal matrixDsuch that

(3) Hence describe the transformation as a combination of geometrical transformations, stating clearly their order.

I got the answer for question (1) and (2), but I don't get question (3).

Please help! My exam is next week. Thanks.