My Math Forum  

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

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
March 6th, 2014, 06:06 PM   #1
Newbie
 
Joined: Mar 2014

Posts: 1
Thanks: 0

cube root

What is the cube root of (81x^8y^12)?

It is probably super easy, but after several tries, I just give up. Thank you so much!!!

Given answers:

A) 3x^2y^4 cube root of (3x^2)
B) 3x^2y^4 fifth root of (3x^2)
C) 3x^2y^12 cube root of (3x^2)
D) 3x^2y^4 cube root of (3xy)
lila342 is offline  
 
March 6th, 2014, 06:29 PM   #2
Math Team
 
Joined: Dec 2013
From: Colombia

Posts: 7,663
Thanks: 2642

Math Focus: Mainly analysis and algebra
Re: cube root

The cube root of any product is the product of the cube root of each elements of the product.

That is:

Also and

Armed with that, you should be able to have another go.
v8archie is online now  
March 6th, 2014, 06:40 PM   #3
Math Team
 
Joined: Sep 2007

Posts: 2,409
Thanks: 6

Re: cube root



HallsofIvy is offline  
March 6th, 2014, 07:13 PM   #4
Global Moderator
 
greg1313's Avatar
 
Joined: Oct 2008
From: London, Ontario, Canada - The Forest City

Posts: 7,943
Thanks: 1132

Math Focus: Elementary mathematics and beyond
Re: cube root



When multiplying exponentials with the same base, add the exponents. The above uses that rule "in reverse".
greg1313 is offline  
March 6th, 2014, 11:57 PM   #5
Global Moderator
 
Joined: Dec 2006

Posts: 20,746
Thanks: 2133

Quote:
Originally Posted by lila342
. . . after several tries, I just give up.
There are only four choices, and the second choice is absurd (the third choice also, if given a moment's thought), so how could you need more than three tries?
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
cube, root



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with Cube Root: achintya Algebra 10 April 5th, 2013 10:33 AM
Cube root of 2 mathmaniac Algebra 49 March 25th, 2013 05:48 PM
Cube Root of -1 Niko Bellic Algebra 6 March 6th, 2013 06:18 PM
challenging cube root problem peri123 Number Theory 2 August 19th, 2008 09:00 AM
Cube root of 2 mathmaniac Number Theory 0 December 31st, 1969 04:00 PM





Copyright © 2019 My Math Forum. All rights reserved.