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anonymous

  • one year ago

Help with radicals

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  1. anonymous
    • one year ago
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    |dw:1434336375394:dw|

  2. anonymous
    • one year ago
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    @peachpi @LeibyStrauss

  3. anonymous
    • one year ago
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    do you know what the conjugate is?

  4. anonymous
    • one year ago
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    @peachpi Idk what that is

  5. anonymous
    • one year ago
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    can you explain

  6. anonymous
    • one year ago
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    the conjugate is where you change the sign of the radical in the denominator and multiply by it to get rid of the square root in the denominator. Your denominator is 9-√5, so the conjugate is 9+√5. So to solve your problem you need to simplify this |dw:1434336787389:dw|

  7. anonymous
    • one year ago
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    @peachpi ok than what would be next?

  8. anonymous
    • one year ago
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    |dw:1434337068377:dw|

  9. anonymous
    • one year ago
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    the top is right. FOIL the bottom

  10. UsukiDoll
    • one year ago
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    the first part of the denominator is right... second part... no because when we are multiply square roots it's just that number

  11. UsukiDoll
    • one year ago
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    for example \[(\sqrt{3})(\sqrt{3}) = 3\] now apply that example to your problem

  12. anonymous
    • one year ago
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    @UsukiDoll I'm lost so how would the denominator look?

  13. UsukiDoll
    • one year ago
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    \[(9-\sqrt{5})(9+\sqrt{5})\] is your denominator .. use foil.. the O and I cancels out

  14. anonymous
    • one year ago
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    so it would be 81+5?

  15. anonymous
    • one year ago
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    yes

  16. UsukiDoll
    • one year ago
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    then just add 81+5

  17. anonymous
    • one year ago
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    ok thanks

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