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Manager
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Please Help! [#permalink] New post 01 Jul 2007, 12:04
How do you solve this ?

2 Power of X - 2 Power of x-2 = 3 times 2 Power of 13

Value of X?
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Re: Please Help! [#permalink] New post 01 Jul 2007, 12:21
Sumithra Sen wrote:
How do you solve this ?

2 Power of X - 2 Power of x-2 = 3 times 2 Power of 13

Value of X?


just think about:

2*2*2*2 - 2*2 =

2*2*(2*2-1) =

2*2*(4-1) =

2*2*3 =

and solve for:

2^x - 2^(x-2) = 3*2^13

2^(x-2)*(2*2 - 1) = 3*2^13

2^(x-2)*3 = 3*2^13

3*2^(x-2) = 3*2^13

x = 15

please post this next time in the correct board ---> "Math Questions and Intellectual Discussions"



:-D
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 [#permalink] New post 01 Jul 2007, 13:28
And that is exactly what I didnt do ! Brilliant!!! Thanks
  [#permalink] 01 Jul 2007, 13:28
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