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anonymous

  • 5 years ago

x^3-729 factor the difference of the two cubes

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  1. amistre64
    • 5 years ago
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    (a^3 - b^3) (a-b)(a^2-ab+b^2) ?

  2. anonymous
    • 5 years ago
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    i am lost

  3. amistre64
    • 5 years ago
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    what is the cuberoot of 729?

  4. anonymous
    • 5 years ago
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    ummm

  5. amistre64
    • 5 years ago
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    9....got it; (x-9)(x^2 +9x +81) or is it... (x-9)(x^2 -9x +81) one or the other, I forget which :)

  6. myininaya
    • 5 years ago
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    its the first one

  7. amistre64
    • 5 years ago
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    hey... i just figured that out :)

  8. myininaya
    • 5 years ago
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    a^3+b^3=(a+b)(a^2-ab+b^2) and a^3-b^3=(a-b)(a^2+ab+b^2)

  9. amistre64
    • 5 years ago
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    yep.... learned it like 4 semesters ago and havent used it since :/

  10. myininaya
    • 5 years ago
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    i always remember that is one or the other, but then i think if i set this =0 and solve for x, I would get x=9 so one of the factors is x-9 since x-9=0

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