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Math Help - Surds

  1. #1
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    Surds

    An easy question that I can't seem to do.

    Show that (2√2+2) = 12+8√2

    The method I have been taught is the grid method (diagram below is meant to be a grid I can't seem to draw it so use your imagination :P ):

    ......2√2.......2
    2√2..X.......4√2
    .
    2.....4√2......4

    But I can't do 2√2 x 2√2. Some help? I can work its meant to be 8 so I can do the question but how would I do that?
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  2. #2
    Moo
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    Hello,

    Quote Originally Posted by Ifailatmaths View Post
    An easy question that I can't seem to do.

    Show that (2√2+2) = 12+8√2

    The method I have been taught is the grid method (diagram below is meant to be a grid I can't seem to draw it so use your imagination :P ):

    ......2√2.......2
    2√2..X.......4√2
    .
    2.....4√2......4

    But I can't do 2√2 x 2√2. Some help? I can work its meant to be 8 so I can do the question but how would I do that?
    2√2 x 2√2=(2x√2)x(2x√2)=(2x2)x(√2x√2)=4x(√2)=4x2

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  3. #3
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    Quote Originally Posted by Moo View Post
    Hello,



    2√2 x 2√2=(2x√2)x(2x√2)=(2x2)x(√2x√2)=4x(√2)=4x2


    Thanks for the really quick reply and nicely layed out answer.
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