Results 1 to 3 of 3
Like Tree1Thanks
  • 1 Post By chiro

Math Help - Proving the equality of two expressions

  1. #1
    Senior Member
    Joined
    Apr 2009
    Posts
    308

    Proving the equality of two expressions

    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    4,166
    Thanks
    762

    Re: Proving the equality of two expressions

    Hey usagi_killer.

    The approach you used is more common than you think (i.e. choosing a different way to prove something rather than the intended way).

    People introduce all kinds of transformations and substitutions (like adding a - a terms in) so it may actually be the case that for a result, someone has added extra terms and then shown equivalence to an existing result (like the example you have shown).

    Unless you specifically have to start out with the LHS, I wouldn't worry about it (and for the future, keep in mind of how introducing new variables and substitutions is useful for showing equivalence between multiple representations of the same thing).
    Thanks from usagi_killer
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Apr 2009
    Posts
    308

    Re: Proving the equality of two expressions

    Hi chiro, yup I try to take note of the different substitutions but this question was actually part of an overall problem where I had to go specifically form the LHS to the RHS. After I had a sneak peek of the solution (which is the RHS), I then backtracked to the LHS which convinced myself that the two expressions are indeed equal, however without sneak peeking at the final answer, there would have been no way for me to go from the LHS to the RHS, I'm wondering if there are any clear methods to manipulate the LHS to the RHS, strictly.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Proving if it's true (Equality)
    Posted in the Trigonometry Forum
    Replies: 10
    Last Post: December 8th 2010, 02:26 AM
  2. Replies: 4
    Last Post: July 6th 2010, 09:16 AM
  3. Replies: 1
    Last Post: July 6th 2010, 08:19 AM
  4. [SOLVED] Proving equality - help please..
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: December 7th 2009, 06:18 AM
  5. Proving an equality
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: July 21st 2009, 02:50 PM

Search Tags


/mathhelpforum @mathhelpforum