Question

COMPLETE

Fill in the numbers resulting from the indicated operation:
2 -1
7
-4
BED
3 4 5 5
-1 2 1 -1
DONE
R2 R3
←
2
hp
-1
-4

Answer 1

`\left[\begin{array}ccc2&-1&-4&7\\-1&2&1&-1\\3&4&5&5\end{array}\right]`

Explanation:

You want the last two rows of the given matrix with rows 2 and 3 swapped.

Swapped rows

The notation ...

`R2\leftrightarrow R3`

means row 3 (R3) is replaced by row 2 (R2), and vice versa.

The answer to the second part of this question has you write row 3 of the original matrix on the second row of the answer matrix. Then you write row 2 of the original matrix on the 3rd row of the answer matrix.

You are simply copying the numbers to a different place. There is no math involved.

The end result is shown above.

__

Additional comment

The notation R1 +R3 ➝ R3 means that row 3 is replaced by the sum of rows 1 and 3. The first number in row 3 resulting from the answer choices would be ...

R1 ⇄ R3: 2, the value formerly in row 1

R2 ⇄ R3: 3, the value formerly in row 2

R1+R3 ➝ R3: 2+(-1) = 1, the sum of values in rows 1 and 3

Since you want the largest of these, the choice R2 ⇄ R3 is the correct one.

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