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Math Help - factoring problems

  1. #1
    Newbie
    Joined
    Feb 2008
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    florida
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    factoring problems

    I got these two wrong and am wondering what the correct answers are? I have bolded and italized my answers. Can you show me where I went wrong.
    1. Which of the following polynomials can be factored as a difference of two squares?
    A) 16x2 + 1
    B) 9y2 - 1
    C) x2 + 4x + 4
    D) 144a2 + 16
    E) all of the above
    2. Factor 4x2 - 20x + 25. Select the answer.
    A) 2x-5
    B) (2x-5)2
    C) (2x+5)2
    D) 2x+5
    E) none of these
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  2. #2
    Super Member
    Joined
    Oct 2007
    From
    London / Cambridge
    Posts
    591
    For part 1 the questions says a difference of two squares.

    so out of A, B, C and D which one has two squares being subtracted ?

    for part 2, If you failed to factor the expression maybe you could try and expand C and B and see which one works.
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