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InspectorJoe

  • one year ago

I'm trying to check my answer but it appears wrong based on what the book says. Factors by grouping. 24x^3-36x^2+72X-108 my answer was : (2x-3)(12x^2+36) please help

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  1. anonymous
    • one year ago
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    yours in incomplete. 12x + 36 can be factored further by pulling a gcf out

  2. inspectorjoe
    • one year ago
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    but I did? here is my problem:

  3. inspectorjoe
    • one year ago
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    24X^3-36x^2+72X-108 12x2(2X-3)+36(2x-3) (2x-3)(12x2+36) ???? NOt sure what I did wrong Thanks in advance.

  4. anonymous
    • one year ago
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    you didn't do anything wrong, it's just that there's another step. You have (2x - 3)(12x² + 36) 2x - 3 can't be factored anymore 12x² + 36 can have a gcf of 12 factored out

  5. madhu.mukherjee.946
    • one year ago
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    (2x-3)12(x^2+3)

  6. anonymous
    • one year ago
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    \[12(2x-3)(x^2+3)\]

  7. madhu.mukherjee.946
    • one year ago
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    @peachpi thats right:)

  8. inspectorjoe
    • one year ago
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    So I need to factor my answer which I already had factor previously! So it's possible that once you have factor a problem your answer my still need to be factor a bit more. ?

  9. anonymous
    • one year ago
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    yes, that's fairly often the case

  10. madhu.mukherjee.946
    • one year ago
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    yes.unless you get it in the most simplest form

  11. madhu.mukherjee.946
    • one year ago
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    remember in these cases you got to reduce the equation to the simplest form

  12. inspectorjoe
    • one year ago
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    would there had been another way to factor from the start or this would of been the only way which and I would just had to do the extra step at the end ?

  13. madhu.mukherjee.946
    • one year ago
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    this is the best possible easy way

  14. inspectorjoe
    • one year ago
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    but my final answer would not match meaning I have a negative and a positive answer. For some reason I though that would be wrong ?

  15. madhu.mukherjee.946
    • one year ago
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    whats the answer given in your book

  16. inspectorjoe
    • one year ago
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    The book says the opposite? = 12(2x-3)(x2+3)

  17. madhu.mukherjee.946
    • one year ago
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    thats what you have got

  18. inspectorjoe
    • one year ago
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    this was my original answer: (2x-3)(12x2+36)

  19. inspectorjoe
    • one year ago
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    great I just figured it out thanks

  20. inspectorjoe
    • one year ago
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    would you please take a look at another problem for me?

  21. madhu.mukherjee.946
    • one year ago
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    say

  22. inspectorjoe
    • one year ago
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    a^3-3a^2-2a+6 my answer was way off even after changing the - to + and making the - 2a to +(-2a+6)?

  23. madhu.mukherjee.946
    • one year ago
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    answer will be (a^2-2)(a-3)

  24. madhu.mukherjee.946
    • one year ago
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    is it okay

  25. inspectorjoe
    • one year ago
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    that is the answer but can you explain how?

  26. inspectorjoe
    • one year ago
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    or show

  27. madhu.mukherjee.946
    • one year ago
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    yes

  28. madhu.mukherjee.946
    • one year ago
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    a^3-3a^2-2a+6 a^3-2a-3a^2+6 a(a^2-2)-3(a^2-2) (a-3)(a^2-2)

  29. madhu.mukherjee.946
    • one year ago
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    did you now understand?

  30. inspectorjoe
    • one year ago
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    doing the problem myself following your steps....

  31. madhu.mukherjee.946
    • one year ago
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    go on buddy............:)

  32. inspectorjoe
    • one year ago
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    sorry but I don't understand why you re- arrange the order when doing factoring by grouping>?

  33. inspectorjoe
    • one year ago
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    I got the same answer but did not re-arrange the problem

  34. madhu.mukherjee.946
    • one year ago
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    rearangement makes it more clear and simple

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