BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Adding Large Exponents

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 216
Joined: Mon Dec 21, 2009 10:26 am
Thanked: 16 times

Adding Large Exponents

by student22 » Wed Mar 03, 2010 8:59 pm
5^12 + 5^13 =

A. 5^25
B. 10^25
C. 6(5^12)
D. 10^12 + 5
E. 2(5^12) + 5
Answer: C

Since there is no rule on adding exponents, what is the trick for solving this kind of problem? Thanks.
Top
Source: — Problem Solving |
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pm
Thanked: 653 times
Followed by:252 members

by papgust » Wed Mar 03, 2010 10:07 pm
Take the common factor out - 5^12

5^12 (1+5) = 5^12 * 6
Top
Master | Next Rank: 500 Posts
Posts: 216
Joined: Mon Dec 21, 2009 10:26 am
Thanked: 16 times

by student22 » Thu Mar 04, 2010 9:33 am
I can't believe I didn't think to factor the problem. I was looking in the wrong direction. Thanks so much!
Top
Newbie | Next Rank: 10 Posts
Posts: 5
Joined: Thu Feb 25, 2010 9:30 pm

by florencejennifer » Tue Mar 09, 2010 3:39 am
5^12 + 5^13 = 5^12(1 + 5) = 6(5^12)

Correct Answer: C.
Top
Post new topic Post Reply
• Page 1 of 1