
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 24th, 2010, 02:20 PM  #1 
Newbie Joined: Jan 2010 Posts: 17 Thanks: 0  variable and the exponent
Thank you for reading, this is a prealgebra question. So the book says I am right on 5^2 = 25, how I solved it is (5^2)=25 But I got this problem wrong, which is, b^2, for b=4, I do not see any parentheses, I solved it as (4^2), therefore 16. But it says that it's +16. Why is it +16 when there are no parentheses? Are you supposed to add the parentheses and calculate when you replace variable with a number? Please help me out, thank you in advance for your generous help. 
January 24th, 2010, 03:28 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
Yes; when the parentheses will affect the value of the expression, you should add them when you replace a variable.


Tags 
exponent, variable 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Help with an exponent question  Kiphyl  Algebra  5  December 30th, 2013 11:09 PM 
Equation with variable in exponent  Bencz  Algebra  4  May 4th, 2013 04:14 PM 
Isolate variable with variable exponent  claudiomalk  Algebra  2  November 9th, 2012 08:52 PM 
Exponent  Thinkhigh  Calculus  3  March 2nd, 2012 06:42 AM 
Complex exponent  greg1313  Applied Math  3  November 17th, 2009 07:39 PM 