Results 1 to 3 of 3

Thread: Rationalizing denominators

  1. January 24th 2009, 04:50 PM #1
    hershey93
    hershey93 is offline
    Newbie
    Joined
    Jan 2009
    Posts
    2

    Rationalizing denominators

    \frac{5 \sqrt{2}}{3 \sqrt{7x}}
    Last edited by mr fantastic; January 24th 2009 at 05:24 PM. Reason: Fixed the latex
    Follow Math Help Forum on Facebook and Google+
  2. January 24th 2009, 05:00 PM #2
    Chris L T521
    Chris L T521 is offline
    Rhymes with Orange Chris L T521's Avatar
    Joined
    May 2008
    From
    Santa Cruz, CA
    Posts
    2,845
    Thanks
    2
    Quote Originally Posted by hershey93 View Post
    \frac{5 \sqrt{2}}{3 \sqrt{7x}}
    You need to multiply by "1", which in our case would be \frac{\sqrt{7x}}{\sqrt{7x}}

    So, you would have \frac{5\sqrt{2}}{3\sqrt{7x}}\cdot\frac{\sqrt{7x}}{ \sqrt{7x}}=\frac{5\sqrt{2}\cdot\sqrt{7x}}{3\left(\ sqrt{7x}\right)^2}=\frac{5\sqrt{14x}}{3\cdot 7x}=\color{red}\boxed{\frac{5\sqrt{14x}}{21x}}

    Does this make sense?
    Last edited by mr fantastic; January 24th 2009 at 05:29 PM. Reason: Edited in context of irrelevant posts that were deleted once the OP's latex was fixed.
    Follow Math Help Forum on Facebook and Google+
  3. January 24th 2009, 05:04 PM #3
    hershey93
    hershey93 is offline
    Newbie
    Joined
    Jan 2009
    Posts
    2
    Quote Originally Posted by Chris L T521 View Post
    You need to multiply by "1", which in our case would be \frac{\sqrt{7x}}{\sqrt{7x}}

    So, you would have \frac{5\sqrt{2}}{3\sqrt{7x}}\cdot\frac{\sqrt{7x}}{ \sqrt{7x}}=\frac{5\sqrt{2}\cdot\sqrt{7x}}{3\left(\ sqrt{7x}\right)^2}=\frac{5\sqrt{14x}}{3\cdot 7x}=\color{red}\boxed{\frac{5\sqrt{14x}}{21x}}

    Does this make sense?
    Ya that seems right...that was exactly what i thought it would look like.
    Thanx for your help Chris..Have a good night
    Last edited by mr fantastic; January 24th 2009 at 05:29 PM. Reason: See above reason
    Follow Math Help Forum on Facebook and Google+
« Logs | subject of the formula »

Similar Math Help Forum Discussions

  1. rationalizing the denominators
    Posted in the Algebra Forum
    Replies: 7
    Last Post: February 6th 2010, 06:48 PM
  2. Rationalise the denominators
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: February 1st 2010, 09:06 AM
  3. rationalising denominators
    Posted in the Math Topics Forum
    Replies: 8
    Last Post: January 16th 2010, 03:34 AM
  4. Rationalizing denominators with cube roots
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 22nd 2009, 10:45 AM
  5. Numerators and Denominators
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 28th 2007, 09:23 AM

Search Tags


/mathhelpforum @mathhelpforum