Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Does GMAT RC seem like an uphill battle? e-GMAT is conducting a free webinar to help you learn reading strategies that can enable you to solve 700+ level RC questions with at least 90% accuracy in less than 10 days. Sat., Oct 19th at 7 am PDT

We need to recognize here that we first need to simplify the left side of the equation. We are adding 2^x FOUR times, which is the same as (4)2^x So...

2^x + 2^x + 2^x + 2^x = 2^a (4)(2^x) = 2^a (2^2)(2^x) = 2^a [I rewrote 4 as 2^2] 2^(x+2) = 2^a [applied the product law for exponents]

Since we have the same base of 2 on each side of the equation, we can conclude that the exponents are equal. So.... x+2 = a Subtract 2 from both sides to get: x = a-2

There are FOUR 2s with power X, so they would add to make 4*(2^)x = (2)^a since 4=2^2 Therefore, (2)^2 *(2)^x = (2)^a which results in; (2)^(2+x) = (2)^a => x+2=a x=a-2
_________________

If someone can do it..... Why not can I???

GMAT Clubbers,,,this can be a much better place if we opt for a usual Thanksgiving and Goodwill gesture by endorsing Kudos!!! So, +1 here if you like my posts....