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algebra

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How do you factor x^2+4
this should be easy, but I'm not quite getting it

  • algebra -

    It's a difference of two squares. It'll be (x+sqrt(4)) and (x-(sqrt(4)), for example---replacing 4 with whatever number is being subtracted from x squared.

    That one is (x-2)(x+2).

    Another example:

    x^2-16 = (x-4)(x+4)

    You can even do this:

    x^4-16 = (x^2-4)(x^2+4)

  • algebra -

    No. I figured it out and it is an imaginary number. Try foiling what u said. It doesn't work.

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