8. If A is an nxn square matrix, and I denotes the nxn identity matrix, which of the following statements is not necessarily true? (a) If the columns of A form an orthogonal set, then A is an orthogonal matrix. (b) If AA" = 1, then A is an orthogonal matrix. (c) If A is an orthogonal matrix, its determinant must be +1. (d) If A is an orthogonal matrix, the linear transformation x- Ax preserves lengths an orthogonality.

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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question number 8
(b) W2 = W,"
(c) There are two vectors zjin W1 and zzin W 2such that y = z1+ z
(d) y is orthogonal to W, and W2.
5. Let W = Span {u}, where u u =
Let y =
The distance from y to W is
(а) 3
(b)
V3
(c) 9
(d) 1
6.
Which of the following statements is always true?
(а) An n x
(b) An orthogonal matrix is orthogonally diagonalizable.
(c) If P is an n x n matrix with orthogonal columns, then PT = p-1.
(d) Every symmetric matrix is orthogonally diagonalizable.
symmetric matrix has n distinct real eigenvalues.
2
7. Find the orthogonal complement of column space of A.
(a) null space of A
(b) null space of A"
(b) row space of A
(d) row space of A'
8. If A is an nxn square matrix, and I denotes the nxn identity matrix, which of the
following statements is not necessarily true?
(a) If the columns of A form an orthogonal set, then A is an orthogonal matrix.
(b) If AA" = 1, then A is an orthogonal matrix.
(c) If A is an orthogonal matrix, its determinant must be ±1.
(d) If A is an orthogonal matrix, the linear transformation x→ Ax preserves lengths and
orthogonality.
9. A is a Hermitian matrix. Then the possible eigen values of A are
(a) 5, -5
(b)
5, -5i
(c)
5i, -5i
(d)
-5, 5i
10. Let A be a Hermitian matrix. Then, which of the following statements is false?
(a)The diagonal entries of A are all real.
(b) There exists a unitary U such that U'AU is a diagonal matrix.
(c) Eigen values are either real or complex.
(b) If A? = I, then A = I.
Transcribed Image Text:(b) W2 = W," (c) There are two vectors zjin W1 and zzin W 2such that y = z1+ z (d) y is orthogonal to W, and W2. 5. Let W = Span {u}, where u u = Let y = The distance from y to W is (а) 3 (b) V3 (c) 9 (d) 1 6. Which of the following statements is always true? (а) An n x (b) An orthogonal matrix is orthogonally diagonalizable. (c) If P is an n x n matrix with orthogonal columns, then PT = p-1. (d) Every symmetric matrix is orthogonally diagonalizable. symmetric matrix has n distinct real eigenvalues. 2 7. Find the orthogonal complement of column space of A. (a) null space of A (b) null space of A" (b) row space of A (d) row space of A' 8. If A is an nxn square matrix, and I denotes the nxn identity matrix, which of the following statements is not necessarily true? (a) If the columns of A form an orthogonal set, then A is an orthogonal matrix. (b) If AA" = 1, then A is an orthogonal matrix. (c) If A is an orthogonal matrix, its determinant must be ±1. (d) If A is an orthogonal matrix, the linear transformation x→ Ax preserves lengths and orthogonality. 9. A is a Hermitian matrix. Then the possible eigen values of A are (a) 5, -5 (b) 5, -5i (c) 5i, -5i (d) -5, 5i 10. Let A be a Hermitian matrix. Then, which of the following statements is false? (a)The diagonal entries of A are all real. (b) There exists a unitary U such that U'AU is a diagonal matrix. (c) Eigen values are either real or complex. (b) If A? = I, then A = I.
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