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# Please Help!

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Manager
Joined: 18 Jun 2007
Posts: 87

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Please Help! [#permalink]

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01 Jul 2007, 13:04
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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VP
Joined: 08 Jun 2005
Posts: 1144

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Re: Please Help! [#permalink]

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01 Jul 2007, 13:21
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"

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Manager
Joined: 18 Jun 2007
Posts: 87

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01 Jul 2007, 14:28
And that is exactly what I didnt do ! Brilliant!!! Thanks

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01 Jul 2007, 14:28
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# Please Help!

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