Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ParthKohli

  • one year ago

Factor.

  • This Question is Closed
  1. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1 Attachment
  2. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I know this simplifies to\[\left(\dfrac{2}{3}x + \dfrac{5}{3}y\right)^3 + \rm blah\]

  3. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So for the first two terms, should I use \(a^3 + b^3 = (a + b)(a^2 - ab + b^2)\)?

  4. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    That'd make stuff very long.

  5. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    its like \((a+b)^3+(c-b)^3-(a+c)^3\)

  6. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah. :-|

  7. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Wait, so\[(a + c)(a^2 + 2ab + b^2 - (a+b)(c -b) + c^2 - 2cb + b^2) - (a + c)^3\]

  8. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \(\large = 3(a+b)(a+c)(b-c)\)

  9. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How did you get that?

  10. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It's correct, but is it some sort of identity taught?

  11. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ok, first take last 2 terms, (c-b)^3-(a+c)^3 = ... ? use A^3-B^3 =...

  12. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    not identity, you need to work that out...

  13. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    its quite long though

  14. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[a^3 - b^3 = (a - b)(a^2 + ab + b^2)\]So here,\[= -(b +a)(\cdots)\]Err

  15. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No shortcuts?

  16. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    none that i can think of.

  17. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    There's always a shortcut in exam questions. It's not like an Olympiad one.

  18. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    then you must be having choices ?

  19. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No choices given. That's all.

  20. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :-(

  21. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    then i'll wait for someone to suggest a shortcut.....

  22. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    OK, thanks for the support :-)

  23. some_someone
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Is Pascal's Triangle any useful? http://www.mathsisfun.com/pascals-triangle.html

  24. some_someone
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I usually use that, but i don't know if its going to help you?

  25. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @hartnn Oh BTW, I found the solution.

  26. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    any shortcuts ?

  27. hartnn
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    isn't that exactly what i told you ?

  28. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :-P

  29. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.