Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

AonZ

I forgot how to factorise this! :( 3x^2 +2xy - 8y^2 - 8x +14y-3

  • 8 months ago
  • 8 months ago

  • This Question is Closed
  1. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Is this your equation? \[3x^2 +2xy - 8y^2 - 8x +14y-3\]

    • 8 months ago
  2. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

    • 8 months ago
  3. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry, I was trying to get my question answered.. Anyways! What do we know? We know that the following can be factored out: \[x^2\]\[8y^2\]\[14\] I left out 3 and why because they can only be only be factored out by 1.

    • 8 months ago
  4. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Not "why". I meant "y"

    • 8 months ago
  5. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    umm ok...

    • 8 months ago
  6. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Am I not making any sense? damn

    • 8 months ago
  7. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    for some reason i cant factorise this question :/ i dont see taking out these common factors to be any help...

    • 8 months ago
  8. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    i know its possible to factorise this but i ahve no idea how http://www.wolframalpha.com/input/?i=factorize+3x%5E2+%2B2xy+-+8y%5E2+-+8x+%2B14y-3

    • 8 months ago
  9. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    It will! Promise.

    • 8 months ago
  10. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    umm, what method of factorising is this?

    • 8 months ago
  11. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    REVERSE FOIL Starting with 3x^2 and 8y^2, what can they be factored into?

    • 8 months ago
  12. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    3 and 1, x and x 2 and 4, y and y

    • 8 months ago
  13. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry, but i dont understand what your talking about :/

    • 8 months ago
  14. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    \[3x \times x = 3x^2\]\[2y \times 4y = 8y^2\] Is that not correct?

    • 8 months ago
  15. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    yes thats correct

    • 8 months ago
  16. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    But its a negative so \[-4y \times 2y = -8y^2\]

    • 8 months ago
  17. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

    • 8 months ago
  18. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    But really from that link you posted, you can take out \[(x+2y-3)\] From the this you can take out x \[3x^2 + 2xy - 8x\] From this you can factor out 2y \[2xy - 8y^2 +14y\] And lastly -3\[-3\]

    • 8 months ago
  19. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    ...."you can factor out"....

    • 8 months ago
  20. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    I guess you can I tried to find the greatest common factor in each, instead of reverse foil. Reverse FOIL is mostly for trinomials..

    • 8 months ago
  21. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    mhm i tried that. Btw i never done reverse foil before so is there any other way?

    • 8 months ago
  22. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    is it possible if you find the greatest common factor?

    • 8 months ago
  23. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes. I just showed you... Also some methods are: - Number of Terms - Factor Out the GCF First - Reversing FOIL - Guess and Check

    • 8 months ago
  24. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Its possible because that is what I did. For your x, you can factor out x ONLY because 3 is not a factor of 8. Also the lowest variable is x in all three. \[3x^2+2xy−8x\]

    • 8 months ago
  25. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1376184367770:dw|

    • 8 months ago
  26. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    you forgot to completely factor out \[( 8x^2 - 14y)\]

    • 8 months ago
  27. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1376184611607:dw|

    • 8 months ago
  28. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Also, this equation is an alternate form of your polynomial, not your polynomial factored out... Besides did you mean to write this instead?\[x (3 x+2 y-8)+(14-8 y) y-3\]

    • 8 months ago
  29. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    mhm yea

    • 8 months ago
  30. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Its okay :)

    • 8 months ago
  31. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Lets try this again! Take out your GCF from your polynomial.... \[3x^2 +2xy - 8y^2 - 8x +14y - 3\]

    • 8 months ago
  32. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    not sure how...

    • 8 months ago
  33. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    X, Y and your constant are separate cases. Like what I wrote if you scroll up.

    • 8 months ago
  34. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Let me try again! Here is your GCF, right? \[(x+2y − 3)\] When it comes to your x variables, only x can be factored out since 3 is not a factor of 8 even thought 2 is. Also you can't factor out x^2 because each monomial does not x^2. They all have at least one. \[3x^2 + 2xy − 8x\] Also these monomials are the only ones with an "x"

    • 8 months ago
  35. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    still dont get how you got ur GCF...

    • 8 months ago
  36. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    When it come to your y variables, you can factor out 2y because 2 is the greatest common factor. \[2xy−8y^2+14y\] And lastly for -3. It is the only constant. So when factoring, all you will use is (1) (-3) \[−3\]

    • 8 months ago
  37. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you know what the term GCF is? GREATEST COMMON FACTOR

    • 8 months ago
  38. AonZ
    Best Response
    You've already chosen the best response.
    Medals 0

    yea... but how did you get it...

    • 8 months ago
  39. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    I thought I just showed you and explained it to you..

    • 8 months ago
  40. ilfy214
    Best Response
    You've already chosen the best response.
    Medals 0

    EXAMPLE: What are the factors and GCF for these numbers? 2 - 1, 2 3 - 1, 3 12 - 1, 2, 3, 4, 6, 12 The GCF for these is 1.

    • 8 months ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.