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anonymous

  • one year ago

Can someone tell me if this answer is correct or not?

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  1. anonymous
    • one year ago
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    What are the factors of x2 - 81? I put prime

  2. nikato
    • one year ago
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    IM BACK! haha and no, its not prime.

  3. nikato
    • one year ago
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    its a special kind called difference of square. see how 81 is a perfect square because 9^2=81

  4. anonymous
    • one year ago
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    Ah, okay, so would the answer be (x-9) (x-9) then?

  5. nikato
    • one year ago
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    (x-9)(x+9) remember with difference of squares theres is one - and the other is +

  6. nikato
    • one year ago
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    and you can check. (x-9)(x-9)= x^2 -18x+81

  7. anonymous
    • one year ago
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    I did (x-9)(x+9) and that didn't work for me. Are you sure? I got x^2-9x+9x-81 After this point I had to either add the -9 to itself and positive 9 or the other way around which wouldn't equal x^2=-81

  8. Pawanyadav
    • one year ago
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    x^2-y^2= (x+y)(x-y) always. In your question y=9.

  9. anonymous
    • one year ago
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    Wait so do you always have to cross out the two x that isn't squared or cubed?

  10. nikato
    • one year ago
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    ys. because they cancel each other. they add up to 0

  11. nikato
    • one year ago
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    well, only in this problem

  12. anonymous
    • one year ago
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    Ooooh, okay. That makes allot more sense now. Haha, thanks for telling me.

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