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Math Help - Surds

  1. #1
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    Surds

    NO calculator allowed.

    Please include a step-by-step



    How can i make the top answer to a surd?

    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 r_maths View Post
    NO calculator allowed.

    Please include a step-by-step



    How can i make the top answer to a surd?

    Thanks
    sqrt[1200 - 400sqrt(2)]

    factor out 400 out of what's under the squareroot, we get:

    sqrt[400(3 - sqrt(2))]

    now the squareroot of a product = the product of the squareroots, so

    = sqrt(400)*sqrt(3 - sqrt(2))
    = 20*sqrt(3 - sqrt(2)) ..............the sqrt(400) = 20
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  3. #3
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    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 r_maths View Post
    thanks
    sure thing

    by the way, the "math thing" isn't working at the moment. this site uses LaTex, and the system is currently down
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