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Exponent confusion.

  1. Feb 21, 2015 #1
    My TI-89 calculator rearranged $$ 2^{2m+1}-1$$ to $$ 2\times 4^m - 1 $$
    I can't for life of me work out how it did it. Is anybody able to put me out of my misery?

    Thank you in advance!

  2. jcsd
  3. Feb 21, 2015 #2


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    Homework Helper

    It used two exponent rules:



    So start by using the second to get rid of that pesky +1 in [itex]2^{2m+1}[/itex]
  4. Feb 21, 2015 #3
    Oh god! Of course. I must not be feeling well.

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