Quiz about Determinants and Inverses of Matrices

Question 1

What size is this matrix?

Accepted Answer

3x2

Answer

2x2

Answer

2x3

Answer

1x6

Question 2

Dimensions?

Accepted Answer

a

Answer

b

Answer

c

Answer

d

Question 3

What must be true in order to ADD two matrices?

Accepted Answer

The dimensions must be equal.

Answer

They must be square.

Answer

The determinant can't equal 0.

Answer

The column of the 1st must equal the row of the 2nd.

Question 4

Find A+B

Accepted Answer

8 10 8 1

Answer

12 25 7 1

Answer

10 30 0 1

Answer

can't add two together because the rows dont match columns

Question 5

What would be the dimensions (output) of AB?

Accepted Answer

3 X 3

Answer

undefined

Answer

2 X 2

Answer

3 X 2

Question 6

find: B*A

Accepted Answer

47 30 9 5

Answer

17 15
42 35

Answer

10 25 7 1

Answer

not possible because rows do not match columns

Question 7

What is the determinant of this matrix?

Accepted Answer

-2

Answer

2

Answer

10

Answer

24

Question 8

What is the determinant of this matrix?

Accepted Answer

5

Answer

-5

Answer

0

Answer

-12

Question 9

What is the formula for the determinant of a 2x2 matrix?

Accepted Answer

ad-bc

Answer

ab-cd

Answer

ad+bc

Answer

(a+d)(b+c)

Question 10

Calculate the determinant

Accepted Answer

10

Answer

0

Answer

-15

Answer

-70

Question 11

Find the determinant of the given matrix?

Accepted Answer

-5

Answer

5

Answer

0

Answer

-75

Question 12

Find the determinant of the matrix

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 13

Find the determinant of the matrix

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 14

What is the determinant of this matrix?

Accepted Answer

0

Answer

24

Answer

-24

Answer

-12

Question 15

Find the inverse of the matrix.

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

No Inverse Exists

Question 16

Find the inverse of the matrix.

Accepted Answer

No Inverse Exists

Answer

A.

Answer

B.

Answer

C.

Question 17

Find the inverse.

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 18

What is the inverse of this matrix?

Accepted Answer

_{(1/25) (-4/25)}
_{(3/25) (13/25)}

Answer

_{(1/5) (-4/5)}
_{(3/5) (13/5)}

Answer

_{(6/25) (-2/25)}
_{(2/25) (9/25)}

Answer

_{(1/150) (-4/150)}
_{(3/150) (13/150)}

Question 19

Which of the following are NOT inverse matrices of each other?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Determinants and Inverses of Matrices

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