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Math Help - Difference of Two Square Issue

  1. #1
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    Difference of Two Square Issue

    I am doing online homework at CourseCompass.com and got a problem that I cannot figure out. Maybe somebody here can help me?

    Use the difference of two squares formula to factor the polynomial.

    49 - (x+7)

    I got as far as [7 + (x+7)] [ 7 - (x+7)] but I do not know what to do from here.

    The site says the answer is -x(x+14) but I have no idea how they came to that. Ideas?
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  2. #2
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    Re: Difference of Two Square Issue

    Quote Originally Posted by justasiam View Post
    I am doing online homework at CourseCompass.com and got a problem that I cannot figure out. Maybe somebody here can help me?
    49 - (x+7)
    I got as far as [7 + (x+7)] [ 7 - (x+7)] but I do not know what to do from here.
    The site says the answer is -x(x+14) but I have no idea how they came to that. Ideas?
    [7 + (x+7)] [ 7 - (x+7)] correct!
    Now remove parenthesis and combine terms.
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  3. #3
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    Re: Difference of Two Square Issue

    Quote Originally Posted by justasiam View Post
    I am doing online homework at CourseCompass.com and got a problem that I cannot figure out. Maybe somebody here can help me?

    Use the difference of two squares formula to factor the polynomial.

    49 - (x+7)

    I got as far as [7 + (x+7)] [ 7 - (x+7)] but I do not know what to do from here.

    The site says the answer is -x(x+14) but I have no idea how they came to that. Ideas?
    Just keep going.

    (7+x+7)(7-x-7)....
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  4. #4
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    Re: Difference of Two Square Issue

    D'oh!! Combine Like Terms. The 2nd () has the 7s canceling out, therefore I have (x + 14) (-x).

    Thanks guys
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