anonymous
  • anonymous
Evaluate C - D. (Image attached.)
Mathematics
jamiebookeater
  • jamiebookeater
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jhonyy9
  • jhonyy9
???
anonymous
  • anonymous
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anonymous
  • anonymous
Exactly the same just subtract...?

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anonymous
  • anonymous
I don't even understand how to do it though..
ash2326
  • ash2326
\[\left[\begin{matrix}a & b \\c& d\end{matrix}\right]-\left[\begin{matrix}e & f \\g& h\end{matrix}\right]=\left[\begin{matrix}a-e & b-f \\c-g& d-h\end{matrix}\right]\]
anonymous
  • anonymous
Those are just the variables ash2326
ash2326
  • ash2326
Kaup Kel use this to evaluate the matrix subtraction, Did you get it?
anonymous
  • anonymous
I really really just need to learn from scratch how to do this. I don't even know what matrix is....
ash2326
  • ash2326
I'll show you \[\left[\begin{matrix}7 & 11 \\-15& 3\end{matrix}\right]-\left[\begin{matrix}1 & 0 \\4& \frac{-11}{2}\end{matrix}\right]=\left[\begin{matrix}(7-1) & (11-0) \\(-15-4)& (3- \frac{-11}{2})\end{matrix}\right]\]
ash2326
  • ash2326
Kaupkel did you understand this??
anonymous
  • anonymous
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.
ash2326
  • ash2326
Let me give you an idea of matrix
anonymous
  • anonymous
Okay.
ash2326
  • ash2326
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 \[\left[\begin{matrix}a & b \\c& d\end{matrix}\right]\]
ash2326
  • ash2326
Did you get this?
anonymous
  • anonymous
Yes.. so far(:
ash2326
  • ash2326
|dw:1328646952010:dw|Now matrix has rows and columns, in the example I showed you, it has 2 rows and 2 columns.
ash2326
  • ash2326
Got this?
ash2326
  • ash2326
we can have any number of rows or columns, may or may not be equal
anonymous
  • anonymous
Okay.. I'm understanding you so far..
ash2326
  • ash2326
Now last thing for today , matrix when added or subtracted the individual elements are added or subtracted. But remember one thing
anonymous
  • anonymous
But wait! How do I solve one though. That's what I wanted to know the most.
ash2326
  • ash2326
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
ash2326
  • ash2326
Kaupkel, your question has two matrices , both are 2*2, so subtract corresponding elements for example 7-1=6
ash2326
  • ash2326
and do this for remaining 3 and place the result at the respective position, see the post where I'd solved this one above
ash2326
  • ash2326
Kaupkel got it?
anonymous
  • anonymous
Kind of, except what is a corresponding element?
ash2326
  • ash2326
|dw:1328647944077:dw|These are corresponding elements
ash2326
  • ash2326
11 and 0 are also corresponding elements
ash2326
  • ash2326
|dw:1328648206940:dw|
anonymous
  • anonymous
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..
ash2326
  • ash2326
I have solved it, see above
anonymous
  • anonymous
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?
ash2326
  • ash2326
Actually I didn't have space for that, you tell what will be the 4th element?
anonymous
  • anonymous
I'm not real sure what will be the 4th element since it's like a fraction.
ash2326
  • ash2326
3-(-11/2) 3+11/2 6/2+11/2=17/2
anonymous
  • anonymous
so 17/2 is the fourth element?
ash2326
  • ash2326
Yeah kaupkel
ash2326
  • ash2326
got it now?
anonymous
  • anonymous
Yes I do! But are you supposed to solve the elements in the answer in the most recent drawing you did?
ash2326
  • ash2326
yeah , like that and you have to write like that only
anonymous
  • anonymous
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.
anonymous
  • anonymous
So just to be sure, It would be wrtitten like this right? 6 11 -19 17/2
ash2326
  • ash2326
Yeah Kaupkel, it's written like that. Don't be sorry , I'm glad to help :)
anonymous
  • anonymous
Thank you so much!! You are like the awesomest person ever! and the first to actually take time to help me on here...
ash2326
  • ash2326
You'd find more people like me here. It's great that I could help. Do try more problems, you'll learn more. :):)
anonymous
  • anonymous
Okay! Thanks!!
anonymous
  • anonymous
One more thing I need help with, if you don't mind...
ash2326
  • ash2326
Yeah :)
anonymous
  • anonymous
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.
ash2326
  • ash2326
subtract element by element, doesn't matter how many rows are there see|dw:1328650357384:dw|
anonymous
  • anonymous
Yeah, but I don't know which ones to match up with which. You know?
ash2326
  • ash2326
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
anonymous
  • anonymous
So, tell me if I got this right...... 14 6 19 18 11 9 I'll post the problem with it in a sec.
anonymous
  • anonymous
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