Results 1 to 4 of 4

Math Help - Simplifying algebraic expressions

  1. #1
    Newbie
    Joined
    Feb 2013
    From
    England
    Posts
    4

    Simplifying algebraic expressions

    Hi,

    This is quite a basic query but I am having difficulty figuring out the following and would like some assistance.

    (x+3)-(x+1)

    = x+3-x-1

    =2

    I don't understand how we end up with = x+3-x-1

    Could some please explain the steps taken to get here?

    Many thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,383
    Thanks
    1317

    Re: Simplifying algebraic expressions

    Quote Originally Posted by mrmorrison View Post
    Hi,

    This is quite a basic query but I am having difficulty figuring out the following and would like some assistance.

    (x+3)-(x+1)

    = x+3-x-1

    =2

    I don't understand how we end up with = x+3-x-1
    It's the "distributive law": a(b+ c)= ab+ ac. Here -1(x+ 1)= (-1)x+ (-1)(1)= -x- 1.

    Could some please explain the steps taken to get here?

    Many thanks
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2013
    From
    England
    Posts
    4

    Re: Simplifying algebraic expressions

    Thanks for your help, this had made it much clearer!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Mar 2013
    From
    South Africa
    Posts
    5

    Re: Simplifying algebraic expressions

    I use to get so confused with expressions like this but its pretty simple actually
    if you see -+ sign in between the two you should know you have to multiply them with the numbers inside the brackets.
    (x+3) -(x+1)
    (x+3) -1(x+1) there is a imaginary 1 after the negative value if you can see it like that.
    x+3 -x-1
    x+3-x-1
    x-x=0
    3-1=2
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simplifying Algebraic Expressions
    Posted in the Algebra Forum
    Replies: 3
    Last Post: February 25th 2011, 03:20 AM
  2. simplifying algebraic expressions
    Posted in the Algebra Forum
    Replies: 3
    Last Post: July 22nd 2010, 02:17 AM
  3. Replies: 2
    Last Post: April 19th 2010, 01:03 PM
  4. simplifying long algebraic expressions
    Posted in the Algebra Forum
    Replies: 10
    Last Post: September 1st 2009, 04:20 PM
  5. Simplifying Algebraic Expressions
    Posted in the Algebra Forum
    Replies: 3
    Last Post: May 6th 2009, 09:28 AM

Search Tags


/mathhelpforum @mathhelpforum