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Easy problem!

  1. Dec 7, 2004 #1
    can someone / anyone tell me the trick to solve

    501^2 - 400^2

    Beginning to feel a little stupid now :blushing:
  2. jcsd
  3. Dec 7, 2004 #2


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    It's a difference of two squares, a^2-b^2=(a+b)(a-b).
  4. Dec 7, 2004 #3


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    Incidentally, you are not solving anything. You are simplifying a numerical expression. "Solve" generally means you are obtaining the value of one or more unknown quantities.
  5. Dec 7, 2004 #4
    Thank you both
    (seems so obvious now you've helped me simplify it!)
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