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anonymous

  • one year ago

Simplify the radical. 4 square root of 20

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  1. anonymous
    • one year ago
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    would it be 400..

  2. zzr0ck3r
    • one year ago
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    \(4\sqrt{20}=4\sqrt{4*5}=4\sqrt{4}\sqrt{5}\)

  3. anonymous
    • one year ago
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    It cant be, these are the option, 5 to the square root of 16 5 to the square root of 8 8 to the square root of 5 16 to the square root of 5

  4. anonymous
    • one year ago
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    for \[4\sqrt{20}\] i got 17.88

  5. anonymous
    • one year ago
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    But that is not one of the options. @emily_wilson

  6. anonymous
    • one year ago
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    I see that

  7. anonymous
    • one year ago
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    Then what would it be?

  8. anonymous
    • one year ago
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    |dw:1441655707709:dw|

  9. anonymous
    • one year ago
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    That isnt and option either.

  10. anonymous
    • one year ago
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    Do you know how to multiply?

  11. anonymous
    • one year ago
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    no

  12. PinkSapphire
    • one year ago
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    \[8\sqrt{5}\]

  13. PinkSapphire
    • one year ago
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    This is how you do it.\[4\sqrt{20}\]Find the greatest factors of 20. \[4\sqrt{4\times5}\]You can take out the 4 from the square root and it will turn into 2. \[4\times 2\sqrt{5}\]Now multiply 4 times 2. \[8\sqrt{5}\]This is in the simplest form it can be.

  14. PinkSapphire
    • one year ago
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    Do you understand what I did?

  15. zzr0ck3r
    • one year ago
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    If you do not know that \(\sqrt{4}=2\) and that \(4*2=8\), I think it would be a good idea to go back and study some old stuff. Else this will not make any sense to you.

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