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janessia

need help with simplifying radicals

  • one year ago
  • one year ago

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  1. janessia
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    |dw:1341559210514:dw|

    • one year ago
  2. asnaseer
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    the trick with these is to look at the number under the square root sign and see if you can express it as a product of a number that is a perfect square.

    • one year ago
  3. asnaseer
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    so think of how you can form 63 as a product of two numbers, one of which is a perfect square

    • one year ago
  4. janessia
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    nope its not a perfect square

    • one year ago
  5. asnaseer
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    63 is not a perfect square, but can you express 63 as the product of two other numbers, one of which is a perfect square?

    • one year ago
  6. janessia
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    can i do a factor tree?

    • one year ago
  7. asnaseer
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    yes

    • one year ago
  8. janessia
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    ohk hold on

    • one year ago
  9. asnaseer
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    ok

    • one year ago
  10. janessia
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    i got |dw:1341559648703:dw|

    • one year ago
  11. janessia
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    thts wat i got? ignore the bottom part

    • one year ago
  12. asnaseer
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    not quite:\[\sqrt{63}=\sqrt{9*7}=\sqrt{3^2*7}=3\sqrt{7}\]

    • one year ago
  13. asnaseer
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    you have swapped the 3 and 7

    • one year ago
  14. janessia
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    yea thts wat i meant

    • one year ago
  15. asnaseer
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    ok, now don't forget you also have to multiply by that 5 in the original question

    • one year ago
  16. janessia
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    so 5 times the answer we got?

    • one year ago
  17. asnaseer
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    yes - thats right

    • one year ago
  18. asnaseer
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    so what do you get for your final answer?

    • one year ago
  19. janessia
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    ohk hold on dnt leave yet

    • one year ago
  20. asnaseer
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    I won't - don't worry :)

    • one year ago
  21. janessia
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    i got a decimal?

    • one year ago
  22. asnaseer
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    leave the answer in radical form

    • one year ago
  23. janessia
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    ohhhhh

    • one year ago
  24. janessia
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    |dw:1341559908464:dw|

    • one year ago
  25. asnaseer
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    perfect! well done!

    • one year ago
  26. janessia
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    thnk u!!!!

    • one year ago
  27. asnaseer
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    yw :)

    • one year ago
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