+ü - w u² + v) z - iw for the matri 23. 1-4-1 3 2 3 13 24. 3 0 Ï 1-5 0 51 00 0 1-2 0021 0 In Exercises 25 and 26, solve the linear system.

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Chapter2: Second-order Linear Odes
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Linear algebra: please solve q23 and 24 correctly and handwritten 

In Exercises 1-18, s = 1+2i, u = 3 - 2i, v = 4+i,
w = 2-i, and z = 1+i. In each exercise, perform the
indicated calculation and express the result in the form
a + ib.
1. ū
4. z+ w
7. vv
10. z²w
13. u/v
16. (w + v)/u
2. Z
5. u + ū
8. uv
11. uw²
14. v/u²
17. w + iz
Find the eigenvalues and the eigenvectors for the matri-
ces in Exercises 19-24. (For the matrix in Exercise 24,
one eigenvalue is λ = 1 + 5i.)
19.
6 8
24
[49] 20. [44]
-1 2
27. x =
In Exercises 27-30, calculate ||x||.
1+i
2
3. u + v
6. s-s
9. s² - w
12. s(u² + v)
15. s/z
18. s - iw
1-2i
[B]
3+i
29. x =
28. x =
3+i
2-i
30. x =
2i
[4]
3
21.
[34]
23.
1 -4 -1
3 2 3
1 1 3
22.
24.
5-5-5
-1 4 2
3 -5 -3
1-5
0
0
5 1
0 0
1-2
0 0
00 2 1
In Exercises 25 and 26, solve the linear system.
25. (1 + i)x +iy = 5 + 4i
(1 - i)x - 4y = -11+5i
26. (1 - i)x (3+i)y=-5 - i
(2+i)x+ (1+2i)y= 1+6i
4.7 Similarity Transformations and Diagonalization
325
Suppose that A is an (m × n) matrix and B is an
(nx p) matrix. Use Exercise 36 and the properties
of the transpose operation to give a quick proof that
(AB)* = B* A*.
38. An (n xn) matrix A is called Hermitian if A* = A.
a) Prove that a Hermitian matrix A has only real
eigenvalues. [Hint: Observing that x¹ x = x*x,
modify the proof of Theorem 17.]
Transcribed Image Text:In Exercises 1-18, s = 1+2i, u = 3 - 2i, v = 4+i, w = 2-i, and z = 1+i. In each exercise, perform the indicated calculation and express the result in the form a + ib. 1. ū 4. z+ w 7. vv 10. z²w 13. u/v 16. (w + v)/u 2. Z 5. u + ū 8. uv 11. uw² 14. v/u² 17. w + iz Find the eigenvalues and the eigenvectors for the matri- ces in Exercises 19-24. (For the matrix in Exercise 24, one eigenvalue is λ = 1 + 5i.) 19. 6 8 24 [49] 20. [44] -1 2 27. x = In Exercises 27-30, calculate ||x||. 1+i 2 3. u + v 6. s-s 9. s² - w 12. s(u² + v) 15. s/z 18. s - iw 1-2i [B] 3+i 29. x = 28. x = 3+i 2-i 30. x = 2i [4] 3 21. [34] 23. 1 -4 -1 3 2 3 1 1 3 22. 24. 5-5-5 -1 4 2 3 -5 -3 1-5 0 0 5 1 0 0 1-2 0 0 00 2 1 In Exercises 25 and 26, solve the linear system. 25. (1 + i)x +iy = 5 + 4i (1 - i)x - 4y = -11+5i 26. (1 - i)x (3+i)y=-5 - i (2+i)x+ (1+2i)y= 1+6i 4.7 Similarity Transformations and Diagonalization 325 Suppose that A is an (m × n) matrix and B is an (nx p) matrix. Use Exercise 36 and the properties of the transpose operation to give a quick proof that (AB)* = B* A*. 38. An (n xn) matrix A is called Hermitian if A* = A. a) Prove that a Hermitian matrix A has only real eigenvalues. [Hint: Observing that x¹ x = x*x, modify the proof of Theorem 17.]
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