# MA 265 FINAL EXAM Fall 2012

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1 MA 265 FINAL EXAM Fall 22 NAME: INSTRUCTOR S NAME:. There are a total of 25 problems. You should show work on the exam sheet, and pencil in the correct answer on the scantron. 2. No books, notes, or calculators are allowed.. For what value of h is the following linear system CONSISTENT? x 3y = h 2x + 6y = 5 A. h = B. h = 5/2 C. h = 5/2 D. h = 5 E. h = 5 2. For what values of r and s is the linear system INCONSISTENT? A. r = 5 and s = 4 B. r 5 and s = 4 C. r = 5 and s 4 D. r 5 and s 4 E. None of the above x + y + z = x + 3z = 2 + s x y + rz = 3

2 3. Suppose A and B are n n matrices. Which of the following statements are always TRUE? i) ( A) T = (A T ) ii (A + B) T = A T + B T iii) (A T B) T = AB T A. i) only B. ii) only C. i) and ii) only D. ii) and iii) only E. i), ii), and iii) 4. Which of the following statements are always TRUE? i) If a linear system Ax = b has m equations and n unknowns, and m < n, then the system must have infinitely many solutions. ii) If A and B are n n matrices and AB is nonsingular, then both A and B must be nonsingular. iii) If A, B, and C are n n matrices such that AB = AC, then B = C. A. i) only B. ii) only C. i) and ii) only D. ii) and iii) only E. i), ii), and iii) 2

3 5. Which of the following are always true for real square matrices A? i) if λ is an eigenvalue for A then λ is an eigenvalue for A. ii) if v is an eigenvector for A then v is also an eigenvector for 2A. iii) The eigenspace for the matrix A for the eigenvalue λ has dimension equal to the multiplicity of the root λ in the characteristic polynomial p(λ) = det(λi A). A. i) and iii) only B. i) only C. iii) only D. i), ii) and iii) only E. i) and ii) only 6. Let v = are true?, v 2 = 4, v 3 = 5, v 4 = 2. Which of the following statements i) The set {v, v 2, v 3, v 4 } is linearly independent. ii) The set {v, v 2, v 3, v 4 } spans R 3. iii) The set {v, v 2, v 3, v 4 } is a basis for R 3. A. All of the above B. None of the above C. i) only D. ii) only E. ii) and iii) only 3

4 7. For the inverse of the matrix 2, the entry in the second row and first column is A. B. C. - D. /2 E. -/2 8. Given that what is the determinant of det a a 2 a 3 a 4 b b 2 b 3 b 4 c c 2 c 3 c 4 d d 2 d 3 d 4 = 5, a 4 a 2 a 3 a b 4 b 2 b 3 b 2c 4 + 3a 4 2c 2 + 3a 2 2c 3 + 3a 3 2c + 3a d 4 d 2 d 3 d? A. 3 B. -3 C. D. - E. 5 4

5 9. If A is a 3 3 matrix with det A = 3, and B = 2A, what is det(a T B )? A. 8 B. /8 C. /8 D. /2 E. 24. Compute the value of the following determinant: det A. -3 B. -5 C. D. 5 E. 3 5

6 . The dimension of the subspace of R 5 which is spanned by [, 2, 3, 4, 5], [, 2,,, ], [,,,, 3], [2, 4, 6, 8, 3], and [2, 6, 6, 8, ] is A. B. 2 C. 3 D. 4 E Let L : R 3 R 3 be defined by: L([x, y, z]) = [ax 2 + bx, cy + z, d] Which of the following choices of the parameters a, b, c, d gives a linear transformation? A. a =, b = 2, c = 3, d = B. a =, b =, c =, d = C. a =, b = 2, c = 4, d = D. a =, b =, c =, d = E. a = b = c = d = 6

7 3. Let W be the subspace of R 3 spanned by 2 2, 2,. If we apply the Gram-Schmidt procedure to this set to obtain an orthonormal basis for W, we obain the set A., B , 3 C. D. E. 2, ,,,.,. 3,., Let A be an n n nonsingular matrix. Which of the following statements must be true? i) Ax = has infinitely many solutions. ii) A must be row equivalent to the identity matrix. iii) A has rank n. iv) det A. A. All are all true. B. i), ii), and iii) only C. iii) and iv) only D. ii), iii), and iv) only E. i), iii), and iv) only 7

8 5. Let A be an m n matrix. Which of the following statements must be true regarding the nullity (dimension of the null space) of A? i) The nullity of A is the same as the number of nonzero rows in a row echelon form of A. ii) The nullity of A is the same as the dimension of the column space of A. iii) The nullity of A is the same as the nullity of A T. A. None of the statements are correct. B. i) and ii) only C. i) and iii) only D. ii) and iii) only E. All three statements are correct. 6. Let A and B be n n matrices. Which of the following statements must be true? i) If B can be obtained from A by a sequence of row operations, and λ is an eigenvalue for A, then λ is also an eigenvalue for B. ii) det(a + B) = deta+ detb. iii) If A and B are both nonsingular, then A + B is nonsingular. A. None of the statements are correct. B. All of the statements are correct. C. i) only D. i) and ii) only E. i) and iii) only 8

9 7. Which of the following subsets of R 3 are subspaces? i) The set of all vectors [x, y, z] satisfying the condition x + 2y 3z = ii) The set of all vectors [x, y, z] satisfying the condition z = xy iii) The set of all vectors [x, y, z] satisfying the condition x = y A. i) only B. ii) only C. iii) only D. i) and ii) only E. ii) and iii) only 8. Let A =. Which of the following are true? i) λ = 2 is an eigenvalue whose eigenspace has dimension. ii) λ = is an eigenvalue whose eigenspace has dimension 2. iii) λ = is an eigenvalue whose eigenspace has dimension 2. A. i) only B. ii) only C. iii) only D. ii) and iii) only E. None of the statements i)-iii) are correct. 9

10 9. Suppose that A is a 2 2 matrix having eigenvalues λ and λ 2 where λ λ 2. Which of the following statements must be true? i) A is diagonalizable. ii) if v is an eigenvector for λ, and v 2 is an eigenvector for λ 2, then {v, v 2 } is a linearly independent set. iii) if v is an eigenvector for λ, and v 2 is an eigenvector for λ 2, then {v, v 2 } is an orthogonal set. A. i) only B. ii) only C. iii) only D i) and ii) only E. i) and iii) only 2. Let L : R 3 R 2 be defined by L x x 2 = x 3 matrix representing L is [ x + 2x 2 3x 2 2x 3 ]. Then the standard A. B. C. D. E. [ 3 ] 2 2 [ 2 ] 3 2 [ 2 ]

11 2. Let W be the subspace of R 4 spanned by 2, , 7 8 9, 2. Then the dimension of the orthogonal complement W is A. B. C. 2 D. 3 E Consider the following inconsistent linear system Ax = b, where A = 2 2, b =. 3 The least squares solution of the linear system is A. ˆx = /7 B. /7 ˆx = /7 C. ˆx = /7 D. ˆx = /7 E. ˆx = /7

12 4 23. Let A =. For which matrix P is it true that P 2 AP = D, where D is a diagonal matrix? A. P = 4 B. 4 P = C. P = 4 D. 4 P = E. /3 2/3 P = /6 /6 24. Which of the following statements are always true for a real square matrix A? i) If A is symmetric, all eigenvalues of A are real. ii) If A is an orthogonal matrix, then the columns of A form an orthonormal set. iii) If all eigenvalues of A are then A is similar to the identity matrix. A. i) only B. iii) only C. i) and ii) only D. i) and iii) only E. i), ii), and iii) 2

13 25. For the differential equation with initial condition x() = x 2 = x 2 3, we have x() = A. (2e 3 + e, 2e 3 e ) T B. (3e 2 + e 3, e 2 e 3 ) T C. (e 2 e 3, e 2 + e 3 ) T D. (e 4 5, e 4 + 5) T E. (e + e 2, e e 2 ) T 3

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