Posted by **lizzie** on Friday, August 12, 2011 at 6:25pm.

How would I do these Matrices?

1.

|1/2 14

10 -8|

2,

Let matrix A = [8 -2

4 7 ]

Let matrix B = 2A, Find b_22

- Algebra-Matrix -
**Damon**, Friday, August 12, 2011 at 7:03pm
1.

What do you want to do to it? Find the determinant?

If so

(1/2)(-8) - (14)(10)

= -4 -140

= -144

2.

2*7 = 14

- Algebra-Matrix -
**lizzie**, Friday, August 12, 2011 at 7:16pm
Is this right then?

|12 -21

-2 -2/3|

answer-1/50

- Algebra-Matrix -
**Damon**, Friday, August 12, 2011 at 7:19pm
| 12 -21 |

| -2 -2/3|

12(-2/3) -(-21*-2)

= -8 - 42

= -50

- Algebra-Matrix -
**lizzie**, Friday, August 12, 2011 at 7:32pm
What about this one? Correct?

|1 0

0 1|

The answer would be 1

- Algebra-Matrix -
**Damon**, Friday, August 12, 2011 at 8:10pm
Yes.

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