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    aizak23's Avatar
    aizak23 Posts: 3, Reputation: 1
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    #1

    Jul 26, 2008, 11:34 AM
    factor completely 125 -27z^3?
    I really need help with this problem and I know it is easy but I forgot how to factor completely 125 -27z^3. please help me!!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 26, 2008, 11:42 AM
    Note the difference of two cubes
    aizak23's Avatar
    aizak23 Posts: 3, Reputation: 1
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    #3

    Jul 26, 2008, 11:47 AM
    Yea I remember now!
    Is this the answer? Jajaja
    Just to be sure!
    (5-3)(25+15w+9w)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Jul 26, 2008, 12:04 PM
    No, not quite.



    Now use the formula

    Where
    aizak23's Avatar
    aizak23 Posts: 3, Reputation: 1
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    #5

    Jul 26, 2008, 12:09 PM
    Yea!
    I wrote it wrong
    It is (5-3z)(25+15z+9z)
    I couldn't remember that
    But the class is over now
    Thanks!
    m4inguyen's Avatar
    m4inguyen Posts: 1, Reputation: 1
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    #6

    Jan 27, 2011, 08:53 PM
    you still got wrong
    it is (5-3z)(25+15z+9Z^2)
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