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    adkloup's Avatar
    adkloup Posts: 1, Reputation: 1
    New Member
     
    #1

    Jun 9, 2009, 07:48 AM
    practice exam for compass test
    for all x>0 and y>0, the radical expression
    √x
    3√x - √y

    is equivalent to :

    3x - √y
    9x + y

    3x - √xy
    3x + y

    3x + √xy
    9x - y

    3x + √xy
    3x - y

    x
    3x - y

    those are spost to be fractions didn't know how to do that
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
     
    #2

    Jun 9, 2009, 08:44 AM
    Quote Originally Posted by adkloup View Post
    for all x>0 and y>0, the radical expression
    √x
    3√x - √y

    is equivalent to :

    3x - √y
    9x + y

    3x - √xy
    3x + y

    3x + √xy
    9x - y

    3x + √xy
    3x - y

    x
    3x - y

    those are supposed to be fractions didn't know how to do that


    Multiply top and bottom by . The reason I picked that is . I'm trying to get roots out of the denominator.



    I think this is one of your choices.

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