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Linear algebra and its applications 4th edition lay test bank

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Choose the one alternative that best completes the statement or answers the question.. Perform the matrix operation... Find the sizes of the product AB and the product BA, if the product

Trang 1

MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question

Perform the matrix operation

1)

Let A = Find 2A

1) _ A)

B)

C)

D)

3)

Let C = Find (1/2) C

3) _

A)

B)

C)

D)

4)

4) _

A)

B)

C)

D)

5)

Let C = and D = Find C - 4D

5) _

A)

B)

C)

D)

7)

7) _

A)

B)

C)

D)

8)

8) _ A)

B)

C)

D)

Trang 2

and B =

Find A +

B

_

C)

D)

Find the matrix product AB, if it is defined

10)

10)

A)

B)

C)

D)

11)

11)

A)

B)

C)

D)

12)

12)

A)

B)

C)

D)

13)

13)

C)

D)

14)

14)

C)

D)

Trang 3

, B =

_

A)

B)

16)

16)

A)

B)

17)

17)

A)

B)

The sizes of two matrices A and B are given Find the sizes of the product AB and the product BA, if the products are defined

A) AB is 8 × 4, BA is 8 × 4 B) AB is 4 × 4, BA is 4 × 4

C) AB is 4 × 8, BA is 4 × 8 D) AB is 1 × 1, BA is 1 × 1

A) AB is 2 × 1, BA is undefined B) AB is 1 × 2, BA is 1 × 1

A) AB is undefined, BA is 3 × 3 B) AB is 3 × 3, BA is 2 × 2

C) AB is 2 × 2, BA is undefined D) AB is 2 × 2, BA is 3 × 3

A) AB is 2 × 1, BA is 1 × 2 B) AB is 2 × 2, BA is 1 × 1

C) AB is undefined, BA is undefined D) AB is 1 × 2, BA is 2 × 1

Find the transpose of the matrix

22)

22)

Trang 4

A)

B)

C)

D)

23)

23) A)

B)

C)

D)

Decide whether or not the matrices are inverses of each other

24)

24)

25)

25)

26)

and

26)

27)

27)

28)

28)

29)

29)

30)

30)

Trang 5

_

32)

32)

Find the inverse of the matrix, if it exists

33)

33)

A)

B)

C)

D)

34)

34) A)

B)

C)

D)

35)

35)

A)

B) A is not invertible

C)

D)

36)

36)

C)

Trang 6

D)

37)

A =

37)

A)

B)

C)

D)

38)

38) A)

B)

C)

D)

39)

39)

A)

B)

C)

D)

Solve the system by using the inverse of the coefficient matrix

40) 5 + 3 = 3

2 + 5 = 24

40)

41) 6 + 4 = 4

3 = -6

41)

42) 7 - 2 = 2

28 - 8 = 3

42)

43) 2 + 6 = 2

2 - = -5

43)

Trang 7

44) 2 - 6 = -6

3 + 2 = 13

44)

45) 10 - 4 = -6

6 - = 2

45)

46) 2 - 4 = -2

3 + 4 = -23

46)

47) -5 + 3 = 8

2 - 4 = -20

47)

Find the inverse of the matrix A, if it exists

48)

48)

A)

B)

C)

D) does not exist

49)

49)

C)

D)

50)

A =

50)

A)

=

Trang 8

B)

=

C)

D) does not exist

51)

A =

51)

A)

B) does not exist

C)

D)

52)

52)

C)

D)

53)

A =

53)

= C)

=

Trang 9

D)

=

Determine whether the matrix is invertible

54)

54)

55)

55)

Identify the indicated submatrix

56)

56)

57)

57)

Find the matrix product AB for the partitioned matrices

58)

58)

A)

B)

C)

D)

59)

59)

A)

Trang 10

B)

C)

D)

Solve the equation Ax = b by using the LU factorization given for A

60)

A =

60)

A)

x =

B)

x =

C)

x =

D)

x =

61)

A =

61)

A)

x =

B)

x =

C)

x =

D)

x =

Find an LU factorization of the matrix A

62)

A =

62)

A)

B)

C)

D)

63)

A =

63)

A)

A =

B)

A =

Trang 11

=

=

Determine the production vector x that will satisfy demand in an economy with the given consumption matrix C and final demand vector d Round production levels to the nearest whole number

64)

64)

A)

x =

B)

x =

C)

x =

D)

x =

65)

65)

A)

B)

x =

C)

x =

D)

x =

Solve the problem

66) Compute the matrix of the transformation that performs the shear transformation for

and then scales all x-coordinates by a factor of 0.68

66)

A)

B)

C)

D)

67) Compute the matrix of the transformation that performs the shear transformation for

and then scales all y-coordinates by a factor of 0.63

67)

A)

B)

C)

D)

Find the 3 × 3 matrix that produces the described transformation, using homogeneous coordinates

A)

B)

C)

D)

A)

B)

C)

D)

Trang 12

Find the 3 × 3 matrix that produces the described composite 2D transformation, using homogeneous coordinates

70) Rotate points through 45° and then scale the x-coordinate by 0.2 and the y-coordinate by 0.4 70) A)

B)

C)

D)

A)

B)

C)

D)

Find the 4 × 4 matrix that produces the described transformation, using homogeneous coordinates

A)

B)

C)

D)

A)

B)

C)

D)

Determine whether b is in the column space of A

74)

74)

75)

75)

Find a basis for the null space of the matrix

76)

A =

76)

Trang 13

A)

B)

C)

D)

77)

A =

77)

A)

B)

C)

D)

Find a basis for the column space of the matrix

78)

B =

78)

A)

B)

C)

D)

79)

B =

79)

A)

B)

C)

D)

The vector x is in a subspace H with a basis β = { , } Find the β-coordinate vector of x

80)

80)

A)

B)

C)

D)

Trang 14

81)

81)

A)

B)

C)

D)

Determine the rank of the matrix

82)

82)

83)

83)

Trang 15

1) C 2) D 3) C 4) B 5) A 6) D 7) B 8) B 9) C 10) C 11) A 12) C 13) D 14) A 15) B 16) A 17) D 18) B 19) A 20) D 21) C 22) B 23) B 24) B 25) A 26) B 27) B 28) B 29) A 30) B 31) B 32) B 33) B 34) B 35) D 36) A 37) C 38) A 39) A 40) B 41) B 42) D 43) C 44) D 45) B 46) D 47) A 48) D 49) B 50) B 51) C

Trang 16

52) A 53) D 54) A 55) B 56) D 57) B 58) A 59) D 60) C 61) C 62) A 63) C 64) C 65) D 66) A 67) B 68) D 69) B 70) C 71) D 72) A 73) A 74) B 75) B 76) C 77) B 78) A 79) B 80) C 81) D 82) D 83) B

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