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Math Help - Radicals

  1. #1
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    Radicals

    Hello,
    I'm studying for my exam right now and I just cannot recall how to do one radicals question.

    16-sqrt320 / 8
    so that's what I do remember:
    16 - 4sqrt20 / 8
    However I cannot think of any way to continue, I'm pretty sure that it has nothing to do with conjugate?
    Thanks,
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Universe View Post
    Hello,
    I'm studying for my exam right now and I just cannot recall how to do one radicals question.

    16-sqrt320 / 8
    so that's what I do remember:
    16 - 4sqrt20 / 8
    However I cannot think of any way to continue, I'm pretty sure that it has nothing to do with conjugate?
    Thanks,
    first off, use parentheses to clarify your question. is it 16 - \frac {\sqrt{320}}8 ?

    secondly, what are we supposed to be doing here? simplifying??
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  3. #3
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    (16-4sqrt20) / 8 This is the question
    And yes it is simplifying.
    Thanks,
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Universe View Post
    (16-4sqrt20) / 8 This is the question
    And yes it is simplifying.
    Thanks,
    okay. so first note that \sqrt{20} = 2 \sqrt{5} (do you know how i got that?)

    so: \frac {16 - 4 \sqrt{20}}8 = \frac {16 - 8 \sqrt{5}}8 = \frac {16}8 - \frac {8 \sqrt{5}}8 = 2 - \sqrt{5}


    This is my 64th post!!!!!
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  5. #5
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    Yea I got it.
    Thanks for the help.
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