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lokiando

  • one year ago

Easy question! Which is a difference of cubes? a) x^6 – 27 b) x^15 – 36 c) x^16 – 64 d) x^5 – 125

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  1. skullpatrol
    • one year ago
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    Any ideas?

  2. lokiando
    • one year ago
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    this is an example

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  3. lokiando
    • one year ago
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    c

  4. lokiando
    • one year ago
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    x^16-64

  5. skullpatrol
    • one year ago
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    why?

  6. lokiando
    • one year ago
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    8*8=64

  7. skullpatrol
    • one year ago
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    how does that fit the pattern of being a "difference of cubes"?

  8. skullpatrol
    • one year ago
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    |dw:1438203365119:dw|

  9. lokiando
    • one year ago
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    its D

  10. skullpatrol
    • one year ago
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    why?

  11. lokiando
    • one year ago
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    because 5^3=125

  12. skullpatrol
    • one year ago
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    prove it by writing it as a difference of cubes

  13. skullpatrol
    • one year ago
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    you are right 5^3 = 125, but what about x^5?

  14. lokiando
    • one year ago
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    0

  15. skullpatrol
    • one year ago
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    |dw:1438203688682:dw|

  16. skullpatrol
    • one year ago
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    |dw:1438203831486:dw|

  17. skullpatrol
    • one year ago
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    Are you still there?

  18. lokiando
    • one year ago
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    no its closed

  19. lokiando
    • one year ago
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    thank you for your patience

  20. skullpatrol
    • one year ago
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    thanks for trying :-)

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spraguer (Moderator)
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