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    kathy1978's Avatar
    kathy1978 Posts: 1, Reputation: 1
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    #1

    Oct 15, 2010, 09:00 AM
    Solve x2 + 18x + 81 = 0
    Solve x2 + 18x + 81 = 0
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 15, 2010, 09:53 AM

    What are the factors of 81 which add up to 18?
    lighunt's Avatar
    lighunt Posts: 4, Reputation: 1
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    #3

    Oct 27, 2010, 10:06 AM
    You basically need X2 and 18X to add up to a negative 81. So subtract 81 from both sides to create the equation of X2 + 18X = -81. Now add X2 + 18X. This will create the equation of 20X = -81. Now divide 20 on both sides... X = -4.05.
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    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Oct 27, 2010, 10:29 AM
    Quote Originally Posted by lighunt View Post
    You basically need X2 and 18X to add up to a negative 81. So subtract 81 from both sides to create the equation of X2 + 18X = -81. Now add X2 + 18X. This will create the equation of 20X = -81. Now divide 20 on both sides...X = -4.05.
    This is not the correct answer. :rolleyes:
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