Find all School-related info fast with the new School-Specific MBA Forum

It is currently 29 Sep 2014, 22:00

Close

GMAT Club Daily Prep

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Math: Exponents Addition and Subtraction rules

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 17 Oct 2009
Posts: 14
Followers: 0

Kudos [?]: 0 [0], given: 1

Math: Exponents Addition and Subtraction rules [#permalink] New post 26 Dec 2009, 12:02
Hello Guys,

What are the rules on adding and subtracting exponents?

For example: 2^5+2^5+2^5+3^5+3^5?

Is there a quick way to solve this?

(I know the multiplication, division and exponent rules on exponents.)

Cheers,
MathFear
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 365

Kudos [?]: 1806 [0], given: 358

GMAT ToolKit User Premium Member
Re: Math: Exponents Addition and Subtraction rules [#permalink] New post 26 Dec 2009, 14:41
Expert's post
It would go this way:

2^5+2^5+2^5+3^5+3^5 = (2^5+2^5+2^5)+(3^5+3^5) =

3*2^5+2*3^5 = 2*3* (2^4+3^4) =

6 * (16+81) = 6 * 97 = 6*(100-3) = 600 - 18 = 582
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Intern
Intern
avatar
Joined: 17 Oct 2009
Posts: 14
Followers: 0

Kudos [?]: 0 [0], given: 1

Re: Math: Exponents Addition and Subtraction rules [#permalink] New post 10 Jan 2010, 03:56
walker wrote:
It would go this way:

2^5+2^5+2^5+3^5+3^5 = (2^5+2^5+2^5)+(3^5+3^5) =

3*2^5+2*3^5 = 2*3* (2^4+3^4) =

6 * (16+81) = 6 * 97 = 6*(100-3) = 600 - 18 = 582



Hi walker, thank you for your response!

However, I noticed that I didn't copy the question right.

I meant:

2^5 + 2^5 + 3^5 + 3^5 + 3^5

And a Math guy showed me a fast way to calculate this. For me this is a typical trick I'd fall for. I'll just post the fast solution, for my fellow mathn00bs ;)

2 * 2^5 = 2^6 (Because 2 = 2^1 and when multiplying exponents one needs to add them up.)
3 * 3^5 = 3^6 ( // )

So 2^5 + 2^5 + 3^5 + 3^5 + 3^5 = 2^6 + 3^6 (This was the answer they were looking for in the question)
Re: Math: Exponents Addition and Subtraction rules   [#permalink] 10 Jan 2010, 03:56
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic The operation* represents either addition, subtraction, or vaivish1723 9 22 Jan 2010, 23:25
2 Exponent Subtraction hardaway7 3 04 Feb 2009, 17:08
1 Experts publish their posts in the topic Subtracting Exponents bmiller0731 2 03 Feb 2009, 14:27
The operation* represents either addition, subtraction, or sidbidus 8 26 Oct 2007, 22:29
The operation* represents either addition, subtraction, or TOUGH GUY 5 08 Oct 2006, 09:24
Display posts from previous: Sort by

Math: Exponents Addition and Subtraction rules

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.