Algebra-Matrix

posted by lizzie

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

  1. Damon

    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

  2. lizzie

    Is this right then?
    |12 -21
    -2 -2/3|

    answer-1/50

  3. Damon

    | 12 -21 |
    | -2 -2/3|

    12(-2/3) -(-21*-2)
    = -8 - 42
    = -50

  4. lizzie

    What about this one? Correct?
    |1 0
    0 1|
    The answer would be 1

  5. Damon

    Yes.

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