Results 1 to 5 of 5

Math Help - [SOLVED] domain of function

  1. #1
    Newbie
    Joined
    Feb 2009
    Posts
    9

    [SOLVED] domain of function

    For the function f defined by f(x)=3x+4
    9x-2

    I know that for a I substitute x with -2. I just don't know how to solve b,c, & d. The letters are throwing me off.

    a. f(-2)=
    b. f(-x)=
    c. -f(x)=
    d. f(x+h)=
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Feb 2009
    Posts
    9
    9x-2 is supposed to be under 3x+4
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Sep 2008
    From
    West Malaysia
    Posts
    1,261
    Quote Originally Posted by Ashley189 View Post
    For the function f defined by f(x)=3x+4
    9x-2

    I know that for a I substitute x with -2. I just don't know how to solve b,c, & d. The letters are throwing me off.

    a. f(-2)=
    b. f(-x)=
    c. -f(x)=
    d. f(x+h)=

    f(x)=\frac{3x+4}{9x-2}

    (b) just replace x with -x like how you did for -2

    (c) f(x)=-\frac{3x+4}{9x-2}

    (d)replace x with x+h
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Mar 2007
    Posts
    1,240

    Talking

    To learn how to evaluate functions at variables or expressions (instead of only at a number), try some online lessons.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2009
    Posts
    9
    Stapel,

    I got it now. Thanks!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Domain and Range of this Function
    Posted in the Algebra Forum
    Replies: 6
    Last Post: May 7th 2010, 06:33 AM
  2. Replies: 2
    Last Post: September 30th 2009, 05:29 AM
  3. [SOLVED] Find the domain of the composite function
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: February 19th 2009, 11:16 AM
  4. [SOLVED] Find the domain of the function
    Posted in the Pre-Calculus Forum
    Replies: 17
    Last Post: January 27th 2009, 11:50 PM
  5. Replies: 3
    Last Post: September 30th 2008, 03:36 PM

Search Tags


/mathhelpforum @mathhelpforum