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

sarsar56

Factor: 4x2 - 9y2

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    okay use this formula: a^2-b^2=(a-b)(a+b)

    • 2 years ago
  2. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    ur a=2x, b=3y

    • 2 years ago
  3. jimmyrep
    Best Response
    You've already chosen the best response.
    Medals 0

    difference of 2 squares

    • 2 years ago
  4. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    This is a difference of squares: A^2-B^2=(A+B)(A-B) In this case, A=2x and B=3y So 4x^2-9y^2=(2x+3y)(2x-3y)

    • 2 years ago
  5. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Plug that in and get the answer, this is simple, you can doit yourself

    • 2 years ago
  6. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    and jim, guide them but don't post the answers, i think they should do it themselves.

    • 2 years ago
  7. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    What I mean is tell them what to do.

    • 2 years ago
  8. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    i really wish i understood all of this lol

    • 2 years ago
  9. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    true, but I find it helps to step them through it

    • 2 years ago
  10. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    sarsar56, you will need this in your future life.

    • 2 years ago
  11. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    it weill be (2x+3y)(2x-3y)

    • 2 years ago
  12. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    if not sarsar, let me know

    • 2 years ago
  13. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    9x^2+16 so how would id o this one

    • 2 years ago
  14. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Well jim we already factored a couple of problems. Like see what i mean, tell them to use this formula: a^2-b^2 = (a-b)(a+b) Tell them to observe that: 4x2 - 9y2 = (2x)^2-(3y)^2, and tell them to do the substitution to factor.

    • 2 years ago
  15. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Sarsar I don't think that's factorable.

    • 2 years ago
  16. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Wait we can complete the square

    • 2 years ago
  17. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    you can complete the square, but that won't make it factorable

    • 2 years ago
  18. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    how do u know if something is not factorablw

    • 2 years ago
  19. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    thi will be like this (3x+4)(3x-4)

    • 2 years ago
  20. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    I think it can be factored

    • 2 years ago
  21. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    if you have a sum of squares, then it is NOT factorable.

    • 2 years ago
  22. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    whats a sum of squares

    • 2 years ago
  23. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    9x^2+16 (3x)^2 + 2*3x*4 + 4^2 - 2*3x*4

    • 2 years ago
  24. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    (3x+4)^2-24x

    • 2 years ago
  25. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    a square is any expression that can be represented by squaring another expression. For example, 4 is a square of 2 since 2 squared = 4 Also, 4x^2 = (2x)^2 is another square

    • 2 years ago
  26. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    ouch i am sorry i thought there is minuse so sorry!!!

    • 2 years ago
  27. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    And then: (3x+4-sqrt(24x))(3x+4+sqrt(24x))

    • 2 years ago
  28. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    I mean that just makes it uglier haha

    • 2 years ago
  29. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    but when they say "factorable", they mean over the rationals.

    • 2 years ago
  30. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    and you forgot the imaginary terms, which makes it even worse

    • 2 years ago
  31. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    oh i guess, i mean i never learned how u guys do it here in the US.

    • 2 years ago
  32. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    i kind of see it but not really ):

    • 2 years ago
  33. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    don't worry about it, 9x^2+16 is NOT factorable

    • 2 years ago
  34. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    how about this one 2xy-xz+2wy-wz

    • 2 years ago
  35. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Okay sarsar observe what is similar in the equation

    • 2 years ago
  36. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    which would b the 2y?

    • 2 years ago
  37. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    2xy-xz+2wy-wz 2xy+2wy-xz-wz 2y(x+w)-z(x+w)

    • 2 years ago
  38. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    So: (x+w)(2y-z)

    • 2 years ago
  39. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    i think u can do like this : 9x^2 +9+7 then we wil factor : 9(x^2+1)+7 then:( 9+7)(x^2+1)

    • 2 years ago
  40. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    am i right?

    • 2 years ago
  41. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    4ax + 8ay + 3bx + 6by so like in this one, do i start by taking out the GCF?

    • 2 years ago
  42. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry Roh, that's not the correct factorization. You can verify that by expanding

    • 2 years ago
  43. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    no u pulled out 9+7, u can't do that

    • 2 years ago
  44. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    first, group terms (4ax + 8ay) + (3bx + 6by)

    • 2 years ago
  45. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    what comes next?

    • 2 years ago
  46. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    mmmm yeah ur right bahroom

    • 2 years ago
  47. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    Jim where did u get that one from?

    • 2 years ago
  48. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    which one?

    • 2 years ago
  49. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    oh u just took it as an example? I see was talkin about this (4ax + 8ay) + (3bx + 6by)

    • 2 years ago
  50. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    ahhhhh im confused lol

    • 2 years ago
  51. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    I think ima leave, having too much people to help confuses others

    • 2 years ago
  52. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 5

    *too many

    • 2 years ago
  53. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    yoou can factor it by group factoring sarsar no confusing is needed let me do it

    • 2 years ago
  54. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    4ax + 8ay + 3bx + 6by (4ax + 8ay) + (3bx + 6by) 4a(x + 2y) + 3b(x + 2y) (4a+3b)(x + 2y)

    • 2 years ago
  55. sarsar56
    Best Response
    You've already chosen the best response.
    Medals 0

    4ax + 8ay + 3bx + 6by ok so u group the terms (4ax+8ay) (3bx+6by)

    • 2 years ago
  56. jim_thompson5910
    Best Response
    You've already chosen the best response.
    Medals 0

    first group the terms, then pull out the GCF from each group. From there, combine like terms.

    • 2 years ago
  57. Roh
    Best Response
    You've already chosen the best response.
    Medals 0

    4a(x+2y)+3b(x+2y) (x+2y)(4a+3b)

    • 2 years 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.