My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum

LinkBack Thread Tools Display Modes
March 4th, 2014, 04:31 AM   #1
Joined: Dec 2013

Posts: 22
Thanks: 2

Integer Exponent Problem


I've done this problem a number of times and can't seem to come to the correct answer. Here is the problem:


According to WolframAlpha the solution is 16/49 but I always get 16/21. There must be a property or a rule that is missing somewhere. I uploaded an image of my work for the problem for reference.

Any insight as to how to solve the problem to get the correct solution would be appreciated!


Attached Images
File Type: jpg theWork.jpg (36.4 KB, 66 views)
Kiphyl is offline  
March 4th, 2014, 05:00 AM   #2
Math Team
Joined: Sep 2007

Posts: 2,409
Thanks: 6

Re: Integer Exponent Problem

Your error is in the fourth line where has become . That is the fairly common error of thinking that .

Instead do the addition before squaring: and squaring now gives . 1 over that is, of course, .
HallsofIvy is offline  
March 4th, 2014, 05:55 AM   #3
Joined: Dec 2013

Posts: 22
Thanks: 2

Re: Integer Exponent Problem

Thank you so much!!!
Kiphyl is offline  
March 4th, 2014, 09:24 AM   #4
Global Moderator
Joined: Dec 2006

Posts: 20,969
Thanks: 2222

skipjack is offline  

  My Math Forum > High School Math Forum > Algebra

exponent, integer, problem

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tricky exponent problem. FrozenNumber Algebra 3 November 17th, 2013 05:16 PM
Problem with e raised to an exponent? Rocky Revival Calculus 4 July 5th, 2009 10:37 AM
Positive Integer Exponent Pair Puzzle K Sengupta Number Theory 6 March 18th, 2009 04:13 PM
exponent math problem azninvasion01 Algebra 1 March 3rd, 2009 06:12 PM
How can one solve for exponent n in this problem. rune2402 Algebra 2 October 21st, 2007 06:07 AM

Copyright © 2019 My Math Forum. All rights reserved.