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Hey ! Unfortunately, I still don't get where that '3' comes from... Just don't see it... Could anyone explain further in more detail?! Would be great!
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Re: If 2^x-2^(x-2)=3*2^13 what is the value of x? [#permalink]
23 Jul 2013, 10:51

Bunuel wrote:

Step by step:

2^x(1-\frac{1}{2^{2}})=3*2^{13}

2^x(\frac{2^2-1}{2^{2}})=3*2^{13}

Hey, now its clear where the 3 comes from but how did u get the 2^2 there? Sry, was a long day... I bet its easy as hell but I'm just confused atm..
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Re: If 2^x-2^(x-2)=3*2^13 what is the value of x? [#permalink]
23 Jul 2013, 11:41

Hey, that I understand... but how did u get the 2^2 onto the fraction again to get 2^2-1/2^2 ? I must miss something very fundamental indeed..
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Gmat prep exam exponent question [#permalink]
06 Oct 2013, 13:11

Hello Everyone,

While completing the GMAT prep exam I stumbled upon a problem solving question that am not able to crack and I am seeking for some advice/pointers on this question:

If 2^x - 2^x-2 = 3(2^13) what is x?

It would be easier to solve if the 3 was not included in the equation at all but of course nothing about the gmat is easy.

Am not looking for the answer just pointers. I did review the exponent rules from the MGMAT Number Properties guide but according to the rule for a * b^ This kind of expression can not be simplified any further so it's kind of confusing,

While completing the GMAT prep exam I stumbled upon a problem solving question that am not able to crack and I am seeking for some advice/pointers on this question:

If 2^x - 2^x-2 = 3(2^13) what is x?

It would be easier to solve if the 3 was not included in the equation at all but of course nothing about the gmat is easy.

Am not looking for the answer just pointers. I did review the exponent rules from the MGMAT Number Properties guide but according to the rule for a * b^ This kind of expression can not be simplified any further so it's kind of confusing,

Thanks for your help in advance

Merging similar topics. Please refer to the solutions above.