Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Any ideas?

  1. Jan 17, 2009 #1
    any ideas??

    given:
    y=f(x)
    f|(1)=4
    g(x)=f(x2)

    find g|(-1)
    ------------------------------------

    i know that g(-1)=g(1) because g is a squared function of x, but thats about it,
    can i say-

    g|(x)=[f(x2)]|=f|(x2)*(2x)

    and because x=-1, and -12=1, and i know f|(1)=4
    so
    g|(-1)=-8
     
  2. jcsd
  3. Jan 17, 2009 #2

    nrqed

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Re: any ideas??


    Yes, this is exactly right. Good job.
     
  4. Jan 17, 2009 #3

    HallsofIvy

    User Avatar
    Science Advisor

    Re: any ideas??

    Yes, that's exactly right. Although you would be better advised to use ', a single apostrophe to indicate the derivative rather than |.
     
  5. Jan 17, 2009 #4
    Re: any ideas??

    thanks, is there any way i would be able to solve it if i werent given 1 as my x?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook