Results 1 to 7 of 7

Math Help - function question

  1. #1
    klg
    klg is offline
    Newbie
    Joined
    May 2012
    From
    ny
    Posts
    13

    function question

    Let the function f be defined by f(x) = x+1.
    If 2f(p)=20, what is the value of f(3p)?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,607
    Thanks
    1574
    Awards
    1

    Re: function question

    Quote Originally Posted by klg View Post
    Let the function f be defined by f(x) = x+1.
    If 2f(p)=20, what is the value of f(3p)?
    Come on. You do some work.
    You know that 2(p+1)=20.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    klg
    klg is offline
    Newbie
    Joined
    May 2012
    From
    ny
    Posts
    13

    Re: function question

    Plato,
    I am a parent helping her son with his SAT review.
    I have spent HOURS doing math problems and figured all of them out except this one.
    DON'T tell me to do some work.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,607
    Thanks
    1574
    Awards
    1

    Re: function question

    Quote Originally Posted by klg View Post
    Plato,
    DON'T tell me to do some work.
    Frankly I will tell you anything I want because you came off as demanding that we work a problem for you. You could have easily explained your position and your son's problem. But you chose not to explain but demand. We are neither a homework service nor a tutorial service. You did not even atop to consider the help I did give you freely.

    Solve 2(p+1)=20 then find f(3p).

    Let me be blunt with you. If your son cannot do that, then you are wasting money on the SAT.
    I am retired chairman of a university mathematics department so I should know.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Jul 2011
    Posts
    4

    Re: function question

    2(p+1) = 20 => 2p = 18 => p = 9. Plugging into f(3p) = f(27) = 28. To avoid an interaction like above, write out any reasoning (verbal or in symbols).
    Follow Math Help Forum on Facebook and Google+

  6. #6
    klg
    klg is offline
    Newbie
    Joined
    May 2012
    From
    ny
    Posts
    13

    Re: function question

    Tell what you want.
    I have always replied in a thankful affirmative to any help I have received. (only 3 questions total I believe)
    As a math department chairman, you should be aware that sometimes people spend so much time working the difficult problems the obvious gets by them.
    My son is an exceptional student. I am glad you are retired so there is no chance he will end up with you as a professor.
    You have chosen a poor name to represent yourself with.
    Your counterparts on the forum have been very nice.
    Perhaps you should learn from them.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    klg
    klg is offline
    Newbie
    Joined
    May 2012
    From
    ny
    Posts
    13

    Re: function question

    Thank you very much for the explanation!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 12
    Last Post: October 2nd 2011, 06:07 AM
  2. function inside function proofe question
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 13th 2010, 11:32 AM
  3. Replies: 1
    Last Post: May 30th 2009, 02:59 PM
  4. Replies: 1
    Last Post: August 29th 2008, 10:17 AM
  5. Replies: 2
    Last Post: March 30th 2008, 02:28 PM

Search Tags


/mathhelpforum @mathhelpforum