Results 1 to 2 of 2

Math Help - Function f(x) (534)

  1. #1
    Member
    Joined
    Sep 2008
    Posts
    222

    Function f(x) (534)

    Let the function f be defined by f(x)=x+1. If 2f(p)=20, what is the value of f(3p)?

    I got 30 but the correct answer is 28. Why?

    Thanks in advance
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Apr 2005
    Posts
    1,631
    Quote Originally Posted by fabxx View Post
    Let the function f be defined by f(x)=x+1. If 2f(p)=20, what is the value of f(3p)?

    I got 30 but the correct answer is 28. Why?

    Thanks in advance
    It is 28 because...

    f(x) = x +1
    So,
    f(p) = p +1

    2[f(p)] = 20
    f(p) = 20/2 = 10
    p +1 = 10
    p = 9

    f(3p) = 3p +1 = 3(9) +1 = 28
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 20
    Last Post: November 27th 2012, 05:28 AM
  2. Replies: 0
    Last Post: October 19th 2011, 04:49 AM
  3. Replies: 4
    Last Post: October 27th 2010, 05:41 AM
  4. Replies: 3
    Last Post: September 14th 2010, 02:46 PM
  5. Replies: 2
    Last Post: September 2nd 2010, 10:28 AM

Search Tags


/mathhelpforum @mathhelpforum