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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: 20,469 Thanks: 2038 
Yes; when the parentheses will affect the value of the expression, you should add them when you replace a variable.


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exponent, variable 
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