Matrix Operations: Addition, Subtraction, Multiplication

Find A*B, if possible. Show all work for credit.

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns

Find 2A - 3B

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Matrix addition and matrix scalar multiplication both are commutative.

• True

• False

Find matrix B.

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Find the value of y.

What is matrix multiplication?

• first matrix column and second matrix raw must be the same

• first matrix raw and second matrix column must be the same

• both first matrix column and second matrix column must be the same

• both first matrix raw and second matrix raw must be the same

the product BA is________

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• None of the above

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