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Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Question
In Exercises 25-28, determine if the specified linear transformation is (a) one-to-one and (b) onto. Justify each answer.
25. The transformation in Exercise 17

Transcribed Image Text:2
4
es
n
1
In Exercises 15 and 16, fill in the missing entries of the matrix,
assuming that the equation holds for all values of the variables.
15.
16.
? ?
? ?
?
22
?
?
?
?
?
?
?
XI
D-L
X3
X1
X2
=
3x₁ - 2x3
4x1
x1 - x2 + x3
X1 X2
-2x1 + x₂
X1
In Exercises 17-20, show that T is a linear transformation by
finding a matrix that implements the mapping. Note that x₁, x..
are not vectors but are entries in vectors.
17. T(X1, X2, X3, X4) = (0, X₁ + X₂, X₂ + x3, x3 + x4)
18. T(x1, x₂) = (2x₂-3x₁, x₁ - 4x2, 0, X₂)
19. T(X₁, X2, X3) = (x₁ - 5x₂ + 4x3, x2 - 6x3)
20. T(X1, X2, X3, X4) = 2x₁ + 3x3 - 4x4 (T: R4 → R)
21. Let T: R² R² be a linear transformation such that
T(x₁, x₂) = (x₁ + x₂, 4x₁ + 5x2). Find x such that T(x)
(3,8).
=
22. Let T: R² R³ be a linear transformation such that
T(x₁.x₂) = (x₁ - 2x2,-x1 + 3x2, 3x1 - 2x2). Find x such
that T(x) = (-1,4,9).
In Exercises 23 and 24, mark each statement True or False. Justify
each answer.
23. a. A linear transformation T: R" → R" is completely de-
termined by its effect on the columns of the n x n identity
matrix.
b. If T: R² R² rotates vectors about the origin through
an angle o, then T is a linear transformation,
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