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March 26, 2017

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x^2+4x-8


(X+4)^2=6

could you help me please.

  • algebra - ,

    If I only knew what the question was. Is there an equal sign on the first?

  • algebra - ,

    That trinomial is not a perfect square.

  • algebra - ,

    You can easily figure out if a trinomial is a perfect square.
    x^2 + b x + c

    if c = (b/2)^2
    then
    it factors to
    (x + b/2 )^2
    for example

    (x + 3)^2 = x^2 + 6 x + 9
    note that
    9 = (6/2)^2
    so if you were given
    x^2 + 6 x + 9
    you would do
    (6/2)^2 which is 3^2 which is 9
    so sure enought it is a perfect square
    however if you are given
    x^2 + 4 x - 8
    (4/2)^2 = 2 ^2 = 4
    which is NOT - 8 so it is not what you want

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