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anonymous

  • 4 years ago

Evaluate C - D. (Image attached.)

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  1. jhonyy9
    • 4 years ago
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    ???

  2. anonymous
    • 4 years ago
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  3. anonymous
    • 4 years ago
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    Exactly the same just subtract...?

  4. anonymous
    • 4 years ago
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    I don't even understand how to do it though..

  5. ash2326
    • 4 years ago
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    \[\left[\begin{matrix}a & b \\c& d\end{matrix}\right]-\left[\begin{matrix}e & f \\g& h\end{matrix}\right]=\left[\begin{matrix}a-e & b-f \\c-g& d-h\end{matrix}\right]\]

  6. anonymous
    • 4 years ago
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    Those are just the variables ash2326

  7. ash2326
    • 4 years ago
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    Kaup Kel use this to evaluate the matrix subtraction, Did you get it?

  8. anonymous
    • 4 years ago
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    I really really just need to learn from scratch how to do this. I don't even know what matrix is....

  9. ash2326
    • 4 years ago
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    I'll show you \[\left[\begin{matrix}7 & 11 \\-15& 3\end{matrix}\right]-\left[\begin{matrix}1 & 0 \\4& \frac{-11}{2}\end{matrix}\right]=\left[\begin{matrix}(7-1) & (11-0) \\(-15-4)& (3- \frac{-11}{2})\end{matrix}\right]\]

  10. ash2326
    • 4 years ago
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    Kaupkel did you understand this??

  11. anonymous
    • 4 years ago
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    Not at all, but that's okay. You tried to help me, and I appreciate it. I just don't know what I'm going to do. This is all new to me.

  12. ash2326
    • 4 years ago
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    Let me give you an idea of matrix

  13. anonymous
    • 4 years ago
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    Okay.

  14. ash2326
    • 4 years ago
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    Matrix is a rectangular array of numbers or variables . The numbers are called elements of matrix. See this is a matrix with 4 elements a, b, c, d \[\left[\begin{matrix}a & b \\c& d\end{matrix}\right]\]

  15. ash2326
    • 4 years ago
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    Did you get this?

  16. anonymous
    • 4 years ago
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    Yes.. so far(:

  17. ash2326
    • 4 years ago
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    |dw:1328646952010:dw|Now matrix has rows and columns, in the example I showed you, it has 2 rows and 2 columns.

  18. ash2326
    • 4 years ago
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    Got this?

  19. ash2326
    • 4 years ago
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    we can have any number of rows or columns, may or may not be equal

  20. anonymous
    • 4 years ago
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    Okay.. I'm understanding you so far..

  21. ash2326
    • 4 years ago
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    Now last thing for today , matrix when added or subtracted the individual elements are added or subtracted. But remember one thing

  22. anonymous
    • 4 years ago
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    But wait! How do I solve one though. That's what I wanted to know the most.

  23. ash2326
    • 4 years ago
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    The matrices being added should have equal no. of rows and columns. In our example both the matrices have equal no. of rows and columns 2 *2

  24. ash2326
    • 4 years ago
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    Kaupkel, your question has two matrices , both are 2*2, so subtract corresponding elements for example 7-1=6

  25. ash2326
    • 4 years ago
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    and do this for remaining 3 and place the result at the respective position, see the post where I'd solved this one above

  26. ash2326
    • 4 years ago
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    Kaupkel got it?

  27. anonymous
    • 4 years ago
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    Kind of, except what is a corresponding element?

  28. ash2326
    • 4 years ago
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    |dw:1328647944077:dw|These are corresponding elements

  29. ash2326
    • 4 years ago
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    11 and 0 are also corresponding elements

  30. ash2326
    • 4 years ago
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    |dw:1328648206940:dw|

  31. anonymous
    • 4 years ago
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    Thank you for all your time and effort. I kind of understand it now. Can you solve the question I put? I think it would help me understand better, since it's an actual full question..

  32. ash2326
    • 4 years ago
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    I have solved it, see above

  33. anonymous
    • 4 years ago
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    Thanks! I totally understand it now! I'm so excited.. but what about the 4th corresponding element? Did you forget to do it, or did you want me to figure it out?

  34. ash2326
    • 4 years ago
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    Actually I didn't have space for that, you tell what will be the 4th element?

  35. anonymous
    • 4 years ago
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    I'm not real sure what will be the 4th element since it's like a fraction.

  36. ash2326
    • 4 years ago
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    3-(-11/2) 3+11/2 6/2+11/2=17/2

  37. anonymous
    • 4 years ago
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    so 17/2 is the fourth element?

  38. ash2326
    • 4 years ago
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    Yeah kaupkel

  39. ash2326
    • 4 years ago
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    got it now?

  40. anonymous
    • 4 years ago
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    Yes I do! But are you supposed to solve the elements in the answer in the most recent drawing you did?

  41. ash2326
    • 4 years ago
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    yeah , like that and you have to write like that only

  42. anonymous
    • 4 years ago
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    Oh. Okay! I'm so excited that I understand this! Haha. Thank you again for all your help. Sorry for taking up so much of your time too. Lol.

  43. anonymous
    • 4 years ago
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    So just to be sure, It would be wrtitten like this right? 6 11 -19 17/2

  44. ash2326
    • 4 years ago
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    Yeah Kaupkel, it's written like that. Don't be sorry , I'm glad to help :)

  45. anonymous
    • 4 years ago
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    Thank you so much!! You are like the awesomest person ever! and the first to actually take time to help me on here...

  46. ash2326
    • 4 years ago
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    You'd find more people like me here. It's great that I could help. Do try more problems, you'll learn more. :):)

  47. anonymous
    • 4 years ago
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    Okay! Thanks!!

  48. anonymous
    • 4 years ago
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    One more thing I need help with, if you don't mind...

  49. ash2326
    • 4 years ago
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    Yeah :)

  50. anonymous
    • 4 years ago
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    Thank you! And I just came accross a question on my homework that is exactly what we just did except there's 3 rows of elements.. I'm not real sure how to find the corresponding elements for those.

  51. ash2326
    • 4 years ago
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    subtract element by element, doesn't matter how many rows are there see|dw:1328650357384:dw|

  52. anonymous
    • 4 years ago
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    Yeah, but I don't know which ones to match up with which. You know?

  53. ash2326
    • 4 years ago
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    see Ist row, 1st column matches to 1st row, 1st column of other matrix similarly just add or subtract the elements with same row no. and column no. check this link also http://en.wikipedia.org/wiki/Matrix_addition

  54. anonymous
    • 4 years ago
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    So, tell me if I got this right...... 14 6 19 18 11 9 I'll post the problem with it in a sec.

  55. anonymous
    • 4 years ago
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