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
January 24th, 2010, 02:20 PM   #1
Joined: Jan 2010

Posts: 17
Thanks: 0

variable and the exponent

Thank you for reading, this is a pre-algebra 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.
skarface is offline  
January 24th, 2010, 03:28 PM   #2
Global Moderator
Joined: Dec 2006

Posts: 21,028
Thanks: 2259

Yes; when the parentheses will affect the value of the expression, you should add them when you replace a variable.
skipjack is offline  

  My Math Forum > High School Math Forum > Algebra

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

Copyright © 2019 My Math Forum. All rights reserved.