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Math Help - Matrix help

  1. #1
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    Post Matrix help

    Find 3A-B when
    A= 2 -1
    3 0

    B= 4 -2
    5 1 my answer is 2 -1
    4 1 is this right, thanks for checking and helping me also.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by kwtolley View Post
    Find 3A-B when
    A= 2 -1
    3 0

    B= 4 -2
    5 1 my answer is 2 -1
    4 1 is this right, thanks for checking and helping me also.

    A=\left( \begin{array}{cc} 2&-1 \\ 3&0 \end{array}\right)

    B=\left( \begin{array}{cc} 4&-2 \\ 5&1 \end{array}\right)

    Then:

    <br />
3A-B= 3 \left( \begin{array}{cc} 2&-1 \\ 3&0 \end{array}\right)-\left( \begin{array}{cc} 4&-2 \\ 5&1 \end{array}\right) <br />
<br />
=\left( \begin{array}{cc} 3\times 2-4&3\times(-1)+2 \\ 3 \times 3-5&3 \times 0-1 \end{array}\right) <br />
<br />
= <br />
\left( \begin{array}{cc} 2&-1 \\ 4&-1 \end{array}\right) <br />

    RonL
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  3. #3
    Member
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    Smile thanks again

    Thats what I had, but I liked the way you broke it down. thanks so much.
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