## Hayatcakes Group Title http://i729.photobucket.com/albums/ww292/akatushi101/algeeeeeeeeeee.jpg I need help on the Four questions . 2 years ago 2 years ago

1. Cynosure-EPR

=) Give me just a minute to write them down and snap a pic.

2. Hayatcakes

Okay :)

3. Hayatcakes

also these are Matrices

4. lalaly

$\left[\begin{matrix}2 & 3 \\ 5 & 1\end{matrix}\right]-\left[\begin{matrix}-1 & 7 \\ 9 & 8\end{matrix}\right]=\left[\begin{matrix}2-(-1) & 3-7 \\ 5-9 & 1-8\end{matrix}\right]=\left[\begin{matrix}3 & -4 \\ -4 & -7\end{matrix}\right]$

5. Cynosure-EPR

Are the first/third ones division or addition?

6. Hayatcakes

7. Cynosure-EPR

Thanks!

8. lalaly

oh u do the same, just change the minus sign to plus

9. Cynosure-EPR

10. Cynosure-EPR

Here you go (the first problem is last, because I thought it was a division sign!) http://postimage.org/image/kmf3y8d8n/

11. Hayatcakes

oh okay thanks !

12. Cynosure-EPR

You're welcome!

13. Hayatcakes

why is the third problem not possible?

14. Cynosure-EPR

Because the two matrices are of different dimensions. If you go ahead and try to attempt it, you'll see quickly that you've run out of numbers and have two left over. It simply doesn't work. =)

15. Hayatcakes

I have three questions left from this matrice ..can you help me :S?

16. Cynosure-EPR

Sure thing!

17. Hayatcakes
18. Hayatcakes

the 6th question there is no "-" or " + " so i think we can not operate it?

19. Cynosure-EPR

That would assume that you multiply them.

20. Hayatcakes

but it is set like this [ 1 2 ][1] [3 7] [5]

21. Cynosure-EPR

It's uploading! You can only multiply matrices if the rows of the first equals the columns of the second. Basically, how that works is you take the terms as such: [ a b ] [1] [ c d ] [5] so that the new matrix is: [ a*1 + b*5 ] [ c*1 + d*5 ]

22. Cynosure-EPR

Here ya go: http://postimage.org/image/p1sw2isxt/

23. Hayatcakes

oh okay.

24. Cynosure-EPR

Do you understand?

25. Hayatcakes

Yes.. :) I'm sorry these were the last ones. . these are the last remaining problems http://i729.photobucket.com/albums/ww292/akatushi101/ALGEE222.jpg

26. Cynosure-EPR

I'm sorry, but I have to head off to class now!=( You can try re-posting the new set for someone else to answer or wait a few hours for my response.

27. Hayatcakes

okay thanks for all the help!