1. (a) Use definition of linear transformation to determine whether the transformation T: R - R defined as follows is linear. -y a+ 2y 2r – 4y

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Chapter2: Second-order Linear Odes
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1. (a) Use definition of linear transformation to determine whether the transformation
T:R? → R³ defined as follows is linear.
-y
T
r+ 2y
2.r – 4y
(b) Let T : R" → R" be a linear transformation.
i. Is it always true that T(0) = 0 where the zero vectors live in the appropriate
spaces? Justify.
ii. Does S(0) = 0 mean that S is linear? If not, can you give a counter-example?
(c) Consider the following matrix transformation T : R² → R² defined as
a b
T
d
i. If T rotates the 2D space 150° counter-clockwise, and then reflects the result
across the new r-axis, find a, b, c, d.
ii. What if T reflects the 2D space across the r-axis first and then rotates 150°
counter-clockwise? Do you expect to get the same a, b, c, d? Why or why not?
Transcribed Image Text:1. (a) Use definition of linear transformation to determine whether the transformation T:R? → R³ defined as follows is linear. -y T r+ 2y 2.r – 4y (b) Let T : R" → R" be a linear transformation. i. Is it always true that T(0) = 0 where the zero vectors live in the appropriate spaces? Justify. ii. Does S(0) = 0 mean that S is linear? If not, can you give a counter-example? (c) Consider the following matrix transformation T : R² → R² defined as a b T d i. If T rotates the 2D space 150° counter-clockwise, and then reflects the result across the new r-axis, find a, b, c, d. ii. What if T reflects the 2D space across the r-axis first and then rotates 150° counter-clockwise? Do you expect to get the same a, b, c, d? Why or why not?
2. (a) Solve the following system of linear equations by using Gauss-Jordan elimination
process.
-11 + 3x2 – 2xz + 4.x4
4.x1 + 12x2 + 7.xz – 14.x4
I1 - 3x2 + 4x3 - 874
2
2.r1 – 6x2 + 13 – 2x4
-3.
Write the solution in column form by explicitly isolating the parameter(s) associated
with free variable(s), if there is any.
(b) Consider the following matrix
1 4 -1 -3
2 7
1
A =
1 0
-1 2 -3 -5
i. Find an LU-factorization of A.
ii. Use these L and U to solve the system Ax
b, where x =
and
7
b
-2
(c) Find A-1. Use A-1 to solve the system Ax = b, where A, x and b are the same as
given in 2(b).
Transcribed Image Text:2. (a) Solve the following system of linear equations by using Gauss-Jordan elimination process. -11 + 3x2 – 2xz + 4.x4 4.x1 + 12x2 + 7.xz – 14.x4 I1 - 3x2 + 4x3 - 874 2 2.r1 – 6x2 + 13 – 2x4 -3. Write the solution in column form by explicitly isolating the parameter(s) associated with free variable(s), if there is any. (b) Consider the following matrix 1 4 -1 -3 2 7 1 A = 1 0 -1 2 -3 -5 i. Find an LU-factorization of A. ii. Use these L and U to solve the system Ax b, where x = and 7 b -2 (c) Find A-1. Use A-1 to solve the system Ax = b, where A, x and b are the same as given in 2(b).
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