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can someone provide me with more info on this? i remember

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CEO
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can someone provide me with more info on this? i remember [#permalink] New post 04 Oct 2007, 08:44
can someone provide me with more info on this? i remember learning this in high school but i look thru mgmat books and cannot find this concept.


Example

=5^k - 5^(k-1)
=5^k - (1/5)*5^k
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CEO
CEO
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Joined: 21 Jan 2007
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Location: New York City
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 [#permalink] New post 04 Oct 2007, 08:52
=5^k - (1/5)*5^k
=5^k (1 - (1/5))
=5k*4/5
can we simplify the last step?
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 [#permalink] New post 04 Oct 2007, 08:57
5^k - 5^(k-1)

lets assume k=3 then 5^3-5^2 = 125-25 = 100 hence:

5^k - 5^(k-1) = 5^(k-1)*(5-1) = 5^(k-1)*4

or lets assume k=3

5^k-1 = 5^k/5

since

5^3-1 = 5^3/5 = 125/5 = 25 = 5^3-1 = 5^2

:)
  [#permalink] 04 Oct 2007, 08:57
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can someone provide me with more info on this? i remember

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