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
August 4th, 2013, 09:14 PM   #1
Joined: Aug 2013

Posts: 5
Thanks: 0

Please Help Me Simplify This

I don't understand a word of it. Also, I apologize if this is in the wrong section.

You know that there is an invisible 2 within every square root. Which is why an exponent let's say...x^2 is canceled out when squared. ? x^2 = x However, when there is a value greater than two the index is shown. Both sections of the problem is a cubed root which is why the 3 is there.

[color=#FF0000]3^ ? 54xy^3 - y 3^ ? 128x [/color]

3 is the index of the root, making it a cubed root. Yes, the 3 at the start of the problem is effecting the entire problem. The other 3 in the first section of the problem is an exponent of y. Brackets aren't needed for this problem if they were there they would confuse you even more. This problem comes straight out of my text book.

I've been told the steps are as follows.

3^ ? 54xy^3 - y 3^ ? 128x
= 3^ ? (27*2)xy^3 - y 3^ ? (27*4)x
= 3y 3^ ? 2x - 3y 3^ ? 4x
[color=#0000FF]= 3y (3^ ? 2x - 3^ ? 4x)[/color]

Is the last equation correct? Or is it something else? Please help, I need the answer.
JediZiro is offline  
August 4th, 2013, 09:47 PM   #2
Joined: Aug 2013

Posts: 5
Thanks: 0

Re: Please Help Me Simplify This

Okay, now I am being told this is the correct answer.

?(54xy^3) - y?(128x)
=?(27*2xy^3) - y?(64*2x)
=3y?(2x) - 4y?(2x)

Can anyone verify please?
JediZiro is offline  
August 5th, 2013, 04:49 AM   #3
Global Moderator
greg1313's Avatar
Joined: Oct 2008
From: London, Ontario, Canada - The Forest City

Posts: 7,821
Thanks: 1047

Math Focus: Elementary mathematics and beyond
Re: Please Help Me Simplify This

That is correct.
greg1313 is offline  

  My Math Forum > High School Math Forum > Algebra


Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to simplify this Ronaldo Calculus 1 December 27th, 2012 07:56 AM
Can't simplify Valar30 Elementary Math 3 April 21st, 2011 11:27 PM
how do I simplify this xdeathcorex Calculus 2 August 31st, 2010 01:37 PM
Simplify wulfgarpro Algebra 19 April 26th, 2010 12:56 PM
How to simplify this Ronaldo Complex Analysis 1 December 31st, 1969 04:00 PM

Copyright © 2018 My Math Forum. All rights reserved.