Results 1 to 6 of 6

Math Help - Function Notation help

  1. #1
    Newbie
    Joined
    Sep 2007
    Posts
    3

    Function Notation help

    Just a stupid little question that I donít understand how to solve, & would very much appreciate any kind of help, cheers.


    F(x)=2x^2+3x-1

    find in simplest form: F(x+4)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by jamaljenkins View Post
    Just a stupid little question that I donít understand how to solve, & would very much appreciate any kind of help, cheers.


    F(x)=2x^2+3x-1

    find in simplest form: F(x+4)
    just replace the x in F(x) with x + 4 and simplify
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2007
    Posts
    3
    Pardon me for my idiocy, but the answer in the book is, 2x^2+19x+43 & I donít understand the step by step process of getting there
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by jamaljenkins View Post
    Pardon me for my idiocy, but the answer in the book is, 2x^2+19x+43 & I don’t understand the step by step process of getting there
    F(x) = 2x^2 + 3x - 1

    \Rightarrow F(x + 4) = 2(x + 4)^2 + 3(x + 4) - 1

    now simplify, you do know how to, right?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Sep 2007
    Posts
    3

    Thumbs up

    i see where every number comes from through simplifying but could you for the purposes of progress, just do it for me?. It would be very appreciated.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by jamaljenkins View Post
    i see where every number comes from through simplifying but could you for the purposes of progress, just do it for me?. It would be very appreciated.
    If it can be helped, we don't like doing people's work for them around here. It won't help you as much as if you tried it yourself.

    F(x + 4) = 2(x + 4)^2 + 3(x + 4) - 1

    ............. = 2 \left(x^2 + 8x + 16 \right) + 3x + 12 - 1

    ............. = 2x^2 + 16x + 32 + 3x + 11

    ............. = 2x^2 + 19x + 43

    Now that wasn't so hard was it?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Function notation
    Posted in the Algebra Forum
    Replies: 3
    Last Post: December 8th 2011, 04:53 PM
  2. Function Notation help!
    Posted in the Algebra Forum
    Replies: 7
    Last Post: August 31st 2009, 04:58 PM
  3. Function Notation
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: October 29th 2008, 02:01 PM
  4. Function Notation
    Posted in the Calculus Forum
    Replies: 4
    Last Post: June 4th 2008, 06:17 PM
  5. help me with function notation and other
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: March 29th 2008, 07:12 PM

Search Tags


/mathhelpforum @mathhelpforum