Problem 13 of 22num-013
What is the entry in row 1, column 2 of the matrix , where ?
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Solution walkthrough1:27
- Multiplying a matrix by doubles every entry. Subtracting matrices subtracts entries in the same position.
- Row is the top row and column is the right column. That entry is in and in .
- Double the entry from : .
- Subtract the entry from : .
- Traps: doubles too, uses row , column , and adds instead of subtracting.