Matrices Addition, Subtraction and Multiplication

• 2

• 7

• 4

• -3

Perform the indicated operation.  If it’s not possible, select Not Possible. 

• 7
  -7
  -6
  20

• 7 
  -9
  -6
  20

• Not Possible

• 7
  -9
  2
  20

find: B*A

(this is "matrix B times Matrix A")

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns

Which sums can NOT be made from the following matrices ?

• A+A

• A+C

• B+D

• C+C

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Matrix A is a 2x1 matrix. Matrix B is a 3x2 matrix. Matrix C is 3x1 matrix. Which statement(s) are true.

• A + B results in a 5x3 matrix.

• Matrix C has the same dimensions as the matrix produced from A * B.

• None of the matrices could be added together.

• B × A is possible but A × B is not possible.

• C × A is possible.

Find A + B

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Find Y - X

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Find matrix C = AB

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Find matrix C= BA

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