1. Korr Valmoria's Avatar
    Can anyone help me with my homework, I already answered the rest except this no.2 (I'm screwed). Thank you in advance btw, our topic is on vector space(linear mathematics)
    Calling all Math Geniuses-img_20140318_093807_edit.jpg

    Posted via CB10
    03-17-14 08:51 PM
  2. hamsterwheel's Avatar



    Good luck...hope someone can help
    03-17-14 08:56 PM
  3. incognito312's Avatar
    The answer is always 42 lol

    Z10 leaked
    03-17-14 08:58 PM
  4. coyotebandit77's Avatar
    The limit does not exist
    03-17-14 09:01 PM
  5. igotaq's Avatar
    Brought back memories lol. Unfortunately, I don't remember a thing from college
    03-17-14 09:08 PM
  6. app_Developer's Avatar
    Write out the calculation of the dot product and set that to zero. You basically did a similar calculation in your check for #1.


    Sent from my iPad using Tapatalk
    03-17-14 09:11 PM
  7. Daytona123's Avatar
    Crackberry - Now with (x+y) more maths!
    03-17-14 09:13 PM
  8. eldricho's Avatar
    And just when I thought math at my level is difficult..

    Posted via CB10
    03-17-14 09:31 PM
  9. app_Developer's Avatar
    And just when I thought math at my level is difficult..

    Posted via CB10
    It's very straight forward, I think the OP just psyched himself out? It's not very different from question 1. I won't give the answer until he comes back and tries it, of course.


    Sent from my iPad using Tapatalk
    03-17-14 09:36 PM
  10. bambinoitaliano's Avatar
    Backup, wipe and reload is always the answer!
    loyalIND, Kraken72 and Cynycl like this.
    03-18-14 06:01 AM
  11. middbrew's Avatar
    Backup, wipe and reload is always the answer!
    And all this time I thought the answer was always do a battery pull.
    03-18-14 02:38 PM
  12. middbrew's Avatar
    I do wonder how the OP came out with finishing the homework.
    03-18-14 02:38 PM
  13. app_Developer's Avatar
    I do wonder how the OP came out with finishing the homework.
    Yeah, I was completely ready to help and he never came back to the thread!


    Sent from my iPhone 5S using Tapatalk
    03-18-14 04:55 PM
  14. Daytona123's Avatar
    Since it appears, that the op is gone, could you give us a quick run through, app_developer? I want to see if I was close!
    03-19-14 09:56 PM
  15. app_Developer's Avatar
    Since it appears, that the op is gone, could you give us a quick run through, app_developer? I want to see if I was close!
    Sure, I guess it's safe now? So we have vectors X = [a, 2, 1, a] and Y = [a, -1, -2, -3] and we want the dot product of these two to be zero;

    So calculating the dot product, we have:

    a^2 + (2)(-1) + (1)(-2) + (-3)(a) = 0
    a^2 -3a -4 = 0

    then it's just come down to finding two roots:

    (a-4)(a+1) = 0

    so a = 4 or a = -1
    Last edited by app_Developer; 03-20-14 at 06:18 PM.
    Korr Valmoria likes this.
    03-20-14 05:30 PM
  16. Korr Valmoria's Avatar
    Sure, I guess it's safe now? So we have vectors X = [a, 2, 1, a] and Y = [a, -1, -2, -3] and we want the dot product of these two to be zero;

    So calculating the dot product, we have:

    a^2 + (2)(-1) + (1)(-2) + (-3)(a) = 0
    a^2 -3a -4 = 0

    then it's just come down to finding two roots:

    (a-4)(a+1) = 0

    so a = 4 or a = -1
    My bad! I did not realize that it should be a^2

    P.S. This is the answer that I submitted to my instructor, it should be a^2 I'm so stupid
    Calling all Math Geniuses-img_20140407_035348_hdr.jpg

    Posted via CB10
    04-06-14 02:55 PM
  17. app_Developer's Avatar
    My bad! I did not realize that it should be a^2

    P.S. This is the answer that I submitted to my instructor, it should be a^2 I'm so stupid

    Posted via CB10
    It looks like you had the right idea, just a simple mistake. I hope he gave you partial credit?


    Sent from my iPhone 5S using Tapatalk
    04-09-14 02:01 PM
  18. Daytona123's Avatar
    Looks like I'll scratch mathematician off my career list :P
    eldricho likes this.
    04-09-14 02:44 PM
  19. Jerale's Avatar
    My bad! I did not realize that it should be a^2

    P.S. This is the answer that I submitted to my instructor, it should be a^2 I'm so stupid
    Click image for larger version. 

Name:	IMG_20140407_035348_hdr.jpg 
Views:	143 
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    Posted via CB10
    I worked the problem the best I could and came up with the same answer as you. I have a hard time with algebra.


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    04-09-14 03:14 PM
  20. Korr Valmoria's Avatar
    Idk, our semester has already ended and my instructor haven't returned the paper yet. But well.... learn from your mistake haha thanks for the help btw

    Posted via CB10
    04-09-14 05:57 PM
  21. Korr Valmoria's Avatar
    Yeah~ algebra is pretty tricky

    Posted via CB10
    04-09-14 05:58 PM

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