|14| * |-2|=?
Correct answer: E. 28
- A. -28
- B. -16
- C. -12
- D. 16
- E. 28
Explanation
Matrices can be multiplied, the correct method gives the answer as such. You can only multiply two matrices if their dimensions are compatible , which means the number of columns in the first matrix is the same as the number of rows in the second matrix. If A=[aij] is an m×n matrix and B=[bij] is an n×p matrix, the product AB is an m×p matrix. AB=[cij] , where cij=ai1b1j+ai2b2j
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