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anonymous

  • one year ago

Which expression is a difference of cubes? x^6-6 x^6-8 x^8-6 x^8-8

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  1. anonymous
    • one year ago
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    This isnt math

  2. anonymous
    • one year ago
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    oh wait

  3. anonymous
    • one year ago
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    XD

  4. welshfella
    • one year ago
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    what is it then?

  5. anonymous
    • one year ago
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    im pretty sure it is...

  6. anonymous
    • one year ago
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    NVM This isnt english XD XD XDDXDXDXDXD

  7. anonymous
    • one year ago
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    Im sorry buddy. Hope someone helps you out :)

  8. welshfella
    • one year ago
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    you have to be careful with this question Remember when you multiply terms with exponents like x^2 you ADD the exponents.

  9. welshfella
    • one year ago
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    example x^2 * x^2 = x^(2+2) = x^4

  10. anonymous
    • one year ago
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    yes i understand that bit but all and all im not understanding how to do this question

  11. welshfella
    • one year ago
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    which of the numbers is a perfect cube 6 or 8 ?

  12. anonymous
    • one year ago
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    6

  13. welshfella
    • one year ago
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    no

  14. welshfella
    • one year ago
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    2*2*2 is not 6

  15. anonymous
    • one year ago
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    okay i see what you're saying now. then its 8, so how do i determine the rest?

  16. welshfella
    • one year ago
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    You are now left with 2 choices x^6 or x^8 you now need to think of a term in x which when multiply by itself 3 times = x^6 or x^8

  17. welshfella
    • one year ago
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    - this where where the rule of exponents comes in...

  18. anonymous
    • one year ago
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    the answer should be x^6-8 right?

  19. welshfella
    • one year ago
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    right because x^2 * x^2 * x^2 = x^6

  20. anonymous
    • one year ago
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    thank you!

  21. welshfella
    • one year ago
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    or written another way (x^2)^3 = x^(2*3) = x^6

  22. welshfella
    • one year ago
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    yw

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