Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

C3 help number two.

Announcements Posted on
Applying to Uni? Let Universities come to you. Click here to get your perfect place 20-10-2014
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    As I predicted, I'm well on the way to asking a whole heap of questions about C3. This time I'm having difficult with functions:

    f(x)=x-2
    g(x)=5/(x+2)

    h=fg

    so
    a) find h(x)
    b) find h^-1

    I got h(x) to be 5/(x+2) -2 and x can't equal -2, however I then couldn't do part b) as I kept ending up with either an xy or an x/y when trying to get y by itself.

    Thanks in advance
    • 2 followers
    Offline

    ReputationRep:
    (y+2)(x+2)=5

    x+2=5/(y+2)

    ....
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    (Original post by mathz)
    (y+2)(x+2)=5

    x+2=5/(y+2)

    ....
    And with hindsight, it's actually really obvious...:rolleyes:

    Thanks though, fancy sitting the exam with me and pointing out all the things I miss?

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: September 23, 2012
New on TSR

Submitting your UCAS application

How long did it take for yours to be processed?

Article updates
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.