# 1. What is the determinant of the following matrix? a 1 a 2 4a 3 2a 2 b 1 b 2 4b 3 2b c 1. = 4, then det

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1 What is the determinant of the following matrix? A 0 B 8 C 55 D 0 E 60 If det a a a 3 b b b 3 c c c 3 = 4, then det a a 4a 3 a b b 4b 3 b c c c 3 c = A 8 B 6 C 4 D E 3 Let A be an n n matrix Which of the following statements must be true? (i) If A T = A, then det A must be zero (ii) If A = A, then A must be the identity matrix or the zero matrix (iii) If det A 0, then the homogeneous system Ax = 0 only has the trivial solution A None B (iii) only C (i) and (iii) only D (ii) and (iii) only E (i), (ii) and (iii)

2 4 Which of the following vectors in R 3 is a linear combination of v = [ 4 3 ], v = [ ], v 3 = [ 4 ]? A 0 0 B C 3 D E None of the above 5 Which of the following sets of matrices are vector spaces? (Here and are the usual addition and scalar multiplication of matrices) a b (i) {all matrices such that a + b = 3c d} c d (ii) {all matrices A such that Ax = 0 has a nontrivial solution} (iii) {all matrices A such that Ax = is consistent} A (i) and (ii) B (ii) only C (ii) and (iii) D (i) only E All of them are vector spaces 6 Let P 3 be the set of all polynomials of degree 3 or less Which of the following subsets are subspaces of P 3? (Here and are the standard addition and scalar multiplication) (i) {all polynomials p(x) such that p() 0} (ii) {all polynomials p(x) such that p(x) = p( x)} (iii) {all polynomials p(x) with p(0) = p()} A (i) and (ii) B (ii) only C (ii) and (iii) D (i) and (iii) E All of them are vector spaces

3 0 7 Let A = 0 t 0 Choose a value of t so that the null space of A has 0 t dimension 0 A 0 B C D E No such value of t exists 8 Let A be a 3 5 matrix with rank 3 Which of the following statements is true? A A consistent linear system Ax = b must have a unique solution B The null space of A has dimension 3 C The columns of A form a basis for the column space of A D The system Ax = b is consistent for every b in R 3 E The rows of A form a linearly dependent set 9 Choose a value of a so that the vector a a is orthogonal to the vector A B C 3 D 4 E None of the above 3

4 0 Let A = [ 0 Then 0 i] A is an eigenvector with eigenvalue B is an eigenvector with eigenvalue C is an eigenvector with eigenvalue i D is an eigenvector with eigenvalue i E is not an eigenvector Consider the following differential equation: dx/dt = x + 5y dy/dt = 5x + y Which of the following is a solution: A x = 3e 3t + e t and y = e 3t e t B x = 3e 4t + e 4t and y = e 6t 3e t C x = e 6t + e 4t and y = e 6t e 4t D x = 3e 3t + e t and y = e 3t e t E x = 8e t + 4e 3t and y = 9e t 4e 3t Suppose the vector v = a b c d is orthogonal to 0, Then which of the following statement is always correct: A a = 0, b = c = d B b = 0, a = b = d C c = a = 0, a = b = c D d = 0, a = b = c E a = b = 0, c = d + 0 and 4

5 3 Let C[ π, π] be the real vector space of continuous functions defined on [ π, π] Define an inner product on C[ π, π] by f, g = π π f(t)g(t)dt Then which of the following set of vectors are orthogonal? A, t, t B sin t,, cos t C, e t, e t D, t, t π 3, E None of the above 4 Let A be an n n matrix, which of the following statements is FALSE? A If A is a symmetric matrix, then A T is also symmetric B The product AA T is always symmetric C If A is skew symmetric, then A 3 is symmetric D If A is symmetric, then A + A is symmetric E The sum A + A T is always symmetric 5 A and B are n n invertible matrices, which of the following statements is FALSE? A (A ) = (A ) B (A ) T = (A T ) C (AB ) = BA D (A + B ) = A + B E (aa) = a A for any nonzero real number a 5

6 6 Consider the linear system x + y + 3z = a x y + z = b 3x + y + 4z = c Under which condition will this system be consistent? A a = c b B a = c b C b = a + c D b = a c E c = a + b 7 Which of the following statements is FALSE? A The rows of any invertible n n matrix span R n B The rows of any orthogonal n n matrix span R n C The rows of any elementary n n matrix span R n D The rows of any symmetric n n matrix span R n E The rows of any nonsingular n n matrix span R n 8 Let A = linearly independent? Which of the following collections of vectors is A The rows of the matrix A B The rows of the matrix A T C The rows of the matrix A A T D The first three rows of A E None of the above 6

7 9 In this problem, A is a 5 8 matrix Find the TRUE statement A If rref(a) has five leading s then the columns of A are linearly independent B If the number of leading s of rref(a) equals three, then one can pick three columns of A that span the column space of A C If columns,3 and 8 of rref(a) have no leading then A must have five linearly independent rows D If columns, 3, 4, 5 and 8 of rref(a) are exactly the ones that have no leading then there are five linearly independent rows in A E None of the above What are the eigenvalues of the matrix ? A, B,, 3 C ±, D ±,, 3 E None of the above Which of the following matrices is NOT diagonalizable? A B C D E

8 For an n n real matrix A, which of the following statements are true? i) If A T = A, then 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 equal to, then A is similar to the identity matrix I n A i) only B ii) only C i) and ii) only D i), ii), iii) E None of the above 3 Assume A and B are n n symmetric matrices Which of the following statements are always true? (i) A is symmetric (ii) AB is symmetric (iii) ABA is symmetric A none of these B (i) only C (ii) only D (i) and (iii) only E (i), (ii) and (iii) 4 Let A = of A[B + A T ] and B = Compute the (, 3)-entry A 4 B 8 C 6 D 5 E 04 8

9 5 Let W denote the vector space spanned by the vectors 0 u = 0, u =, and let v = Find the distance from v to W A 0 B C D E 4 9

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