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ParthKohli Group Title

Factor.

  • one year ago
  • one year ago

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  1. ParthKohli Group Title
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    • one year ago
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  2. ParthKohli Group Title
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    I know this simplifies to\[\left(\dfrac{2}{3}x + \dfrac{5}{3}y\right)^3 + \rm blah\]

    • one year ago
  3. ParthKohli Group Title
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    So for the first two terms, should I use \(a^3 + b^3 = (a + b)(a^2 - ab + b^2)\)?

    • one year ago
  4. ParthKohli Group Title
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    That'd make stuff very long.

    • one year ago
  5. hartnn Group Title
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    its like \((a+b)^3+(c-b)^3-(a+c)^3\)

    • one year ago
  6. ParthKohli Group Title
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    Yeah. :-|

    • one year ago
  7. ParthKohli Group Title
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    Wait, so\[(a + c)(a^2 + 2ab + b^2 - (a+b)(c -b) + c^2 - 2cb + b^2) - (a + c)^3\]

    • one year ago
  8. hartnn Group Title
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    \(\large = 3(a+b)(a+c)(b-c)\)

    • one year ago
  9. ParthKohli Group Title
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    How did you get that?

    • one year ago
  10. ParthKohli Group Title
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    It's correct, but is it some sort of identity taught?

    • one year ago
  11. hartnn Group Title
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    ok, first take last 2 terms, (c-b)^3-(a+c)^3 = ... ? use A^3-B^3 =...

    • one year ago
  12. hartnn Group Title
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    not identity, you need to work that out...

    • one year ago
  13. hartnn Group Title
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    its quite long though

    • one year ago
  14. ParthKohli Group Title
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    \[a^3 - b^3 = (a - b)(a^2 + ab + b^2)\]So here,\[= -(b +a)(\cdots)\]Err

    • one year ago
  15. ParthKohli Group Title
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    No shortcuts?

    • one year ago
  16. hartnn Group Title
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    none that i can think of.

    • one year ago
  17. ParthKohli Group Title
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    There's always a shortcut in exam questions. It's not like an Olympiad one.

    • one year ago
  18. hartnn Group Title
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    then you must be having choices ?

    • one year ago
  19. ParthKohli Group Title
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    No choices given. That's all.

    • one year ago
  20. ParthKohli Group Title
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    :-(

    • one year ago
  21. hartnn Group Title
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    then i'll wait for someone to suggest a shortcut.....

    • one year ago
  22. ParthKohli Group Title
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    OK, thanks for the support :-)

    • one year ago
  23. some_someone Group Title
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    Is Pascal's Triangle any useful? http://www.mathsisfun.com/pascals-triangle.html

    • one year ago
  24. some_someone Group Title
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    I usually use that, but i don't know if its going to help you?

    • one year ago
  25. ParthKohli Group Title
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    @hartnn Oh BTW, I found the solution.

    • one year ago
  26. hartnn Group Title
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    any shortcuts ?

    • one year ago
  27. ParthKohli Group Title
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    http://math.stackexchange.com/questions/361002/factoring-a-long-expression-in-the-form-ab3-c-b3-cb3?noredirect=1#comment775818_361002 Yeah, sort of.

    • one year ago
  28. hartnn Group Title
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    isn't that exactly what i told you ?

    • one year ago
  29. ParthKohli Group Title
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    :-P

    • one year ago
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