Exponents on GMAT - Relation between Exponents of 2 (a tricky question from the ANA PREP curriculum)

Given that x = 2^a - 16^15 + 8^18, which of the following values of a...
(a tricky question from the ANA PREP curriculum!)
Join me in my next LIVE Class for free and check out the trial GMAT Prep Package by registering at anaprep.com
(includes Theory Modules, Conceptual Videos, Practice Questions and Weekly Webinars)
The Trial Package gives complete details of all that is included - the format of the content and how to access it. It includes truncated versions of conceptual videos, theory modules, and practice questions.

[@ashishsinha9035]

Thanks Ma’am for using number line approach. I solved this question by calculating the value of equations given in all the options.Though I got the correct answer, the approach consumed a lot of time.

[@karishma.anaprep]

Ah yes, the number line approach is very efficient in most problems in which it can be used.