GMATprep Exponent Question

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mon3045: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Mon Oct 01, 2007 5:05 pm

by mon3045 » Wed Oct 03, 2007 6:07 pm

I need help in solving this exponent problem from the GMATprep test.

2^x - 2^(x-2) = 3*(2^13). What is the value of x? The answer is 15, but I am unsure of how to get there. Please help.

Thanks!

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Source: Beat The GMAT — Problem Solving | Wed Oct 03, 2007 6:07 pm

gmatrant: Master | Next Rank: 500 Posts; Posts: 416; Joined: Wed Oct 03, 2007 9:08 amFollowed by: 1 member; Thanked: 10 times

solution

by gmatrant » Wed Oct 03, 2007 7:06 pm

2^x(1-1/4)=3*2^13
2^x(3/4)= 3*2^13
2^x=2^15
x=15

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mon3045: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Mon Oct 01, 2007 5:05 pm

Thank you

by mon3045 » Thu Oct 04, 2007 12:39 pm

Thank you very much. I was so close. I was messing up on the last part somehow. Thank you for putting me out of my misery.

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