## [answered] Math 111 Assignment 5 Due Tuesday Nov. 17, 2016 1. The line

Math 111 Assignment 5 Due Tuesday Nov. 17, 2016 1. The linear transformation T: R 2 R 2 is pictured at the right.

The starting box is a square with sides x=?1 and y=?1. The

image is a parallelogram with corners at (?2, 3/2), (0, 3/2),

(2, ?3/2), (0, ?3/2) as illustrated at the right.

T

(a) Find the matrix of T in two different ways (and check that

you get the same result).

1 0 (i) Find the images of and directly from the diagram.

0 1 (ii) Write T as the composition of, first a horizontal shear S, then a dilation D, then a reflection R; find the

matrix of each, and multiply them together. That is, I want T of the form: T = RDS.

(b) Let Q be the transformation that applies T twice, that is, it maps x to T(T(x)). Find the matrix of Q.

Check your answer by using the diagram to track the path of the top left-hand corner of the starting box, 1

and compare with what you get by applying the matrix to .

1

(c) Find the matrix of the transformation Z that ?inverts? T, that is, that maps the parallelogram on the

right to the square on the left. Again, check your answer by following a suitable point. 2. The transformation T that maps every point in R3 into its reflection in the plane x + y ? 2z = 0 is

linear. Find its 3?3 matrix. As a check take a point on the plane and see if T maps it to itself. 3. In the diagram below, the 2?2 shaded square centered at the origin is bounded by the lines x = ?1 and

y = ?1. Let T denote the linear transformation that maps the square on the left to the parallelogram at the

right. T (a) Use the structure theorem for linear transformations to find the matrix of T. Check your work with a

suitable point, e.g. x = [1, 1],

(b) Now write T as a product of three transformations, first a dilation D, second a horizontal shear S, and

third a rotation R about the origin. Find matrices for each of the three transformations, and check that

their product RSD gives you the matrix of T. math 111 assignment 4 fall 2015 1 (c) Using the template below, draw the image of the transformed square after each of the three steps.

Take care with the accuracy of your drawing. T D R S math 111 assignment 4 fall 2015 2

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