Determinants and Matrices

Calculate the determinant

• 0

• -15

• -70

• 10

Find the determinant of the given matrix?

• 5

• -5

• 0

• -75

Find the determinant of the matrix

• A

• B

• C

• D

Dimensions?

• a

• b

• c

• d

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

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

Find A+B

• 8     10
  8      1 

• 12     25
  7     1

• 10     30
  0     1

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

find: B*A

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns

Find the determinant of the matrix

• A

• B

• C

• D

Find the inverse.

• A

• B

• C

• D

If A is an invertible matrix of order 3x3 and IAI=9.

Then find IadjAI=

• 18

• 81

• 729

• 9