Matrix review

Add.

• -2   4   -9
  -1   -6   -17
• -8   12   -9
  1   6   17
• -8   4   -9
  15   6   7
• -2   -4   -9
  15   6    7

Subtract

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

Multiply

• 25
  25
  5
• -25
  25
  -5
• -10
  -10
  -6
• 10
  10
  6

Calculate the determinant

• 0
• none
• -32
• -8

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.

What is the value of element M₃₄

• 34
• 42
• 37
• π

When a 3x6 matrix is multiplied by a 6x5 matrix, what will the dimensions of the product be?

• 6x6
• 3x6
• 3x5
• 5x6

Find the determinant of the matrix

• -28
• -20
• 20
• 0

find: B*A

• 47     30
  9     5
• 17     15
  42     35
• 10     25
  7     1
• not possible because rows do not match columns