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    mathgurlie3's Avatar
    mathgurlie3 Posts: 1, Reputation: 1
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    #1

    Jun 7, 2009, 01:52 PM
    radical expressions
    How do you subtract add and multiply radicals with numbers in front like

    4√ 45-√ 75


    And 2√ 5+4√ 20
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 7, 2009, 02:21 PM
    Try breaking the number inside the radical up into a perfect square.

    The second one:





    See? There is a and 4 is a perfect square. So, we can add it to the other.
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