Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    can anyone help me with the fx graphs?i kind of understand and i know somebody posted something on it a few days ago...but i cant seem 2 find it
    e.g y = fx - 2?

    rgrds
    Offline

    1
    ReputationRep:
    I'll try, but it's so complicated I'm not100% sure how to do some questions but here are the basic transformations:

    y=f(x-a) Translates "a" units to left
    y=f(x)-a Translates "a" units down
    y=-f(x) Reflects the graph in x axis
    y=f(-x) Reflects the graph in y axis
    y=f(a-x) Reflects in the line "a/2"
    y=f(2x) Stretch in the x axis direction scale factor of 1/2
    y=2f(x) Stretch in the y axis direction scale factor 2

    Hope that helps!
    Offline

    0
    ReputationRep:
    (Original post by Piggy)
    I'll try, but it's so complicated I'm not100% sure how to do some questions but here are the basic transformations:

    y=f(x-a) Translates "a" units to left
    y=f(x)-a Translates "a" units down
    y=-f(x) Reflects the graph in x axis
    y=f(-x) Reflects the graph in y axis
    y=f(a-x) Reflects in the line "a/2"
    y=f(2x) Stretch in the x axis direction scale factor of 1/2
    y=2f(x) Stretch in the y axis direction scale factor 2

    Hope that helps!
    Now I'm confused cos I thought that y= f(x-a) translated "a" units to the right (positive direction) because of it being the inverse of what you'd expect......or were you including the negative coefficient of "a" when you said it would go left?
    Offline

    11
    ReputationRep:
    (Original post by Gothic pixie)
    Now I'm confused cos I thought that y= f(x-a) translated "a" units to the right (positive direction) because of it being the inverse of what you'd expect......or were you including the negative coefficient of "a" when you said it would go left?
    That is correct. It moves to the right.
    Offline

    1
    ReputationRep:
    For definate:

    y=f(x)+a moves graph up if a is positive

    y=f(x+a) moves graph right if a<0 and left if a>0

    y=-f(x) reflection in x axis

    y=f(-x) reflection in y axis

    y=af(x) stretch of scale factor a in y direction

    y=f(ax) stretch of scale factor 1/a in x direction

    Hope it helped!
    Offline

    1
    ReputationRep:
    (Original post by Gothic pixie)
    Now I'm confused cos I thought that y= f(x-a) translated "a" units to the right (positive direction) because of it being the inverse of what you'd expect......or were you including the negative coefficient of "a" when you said it would go left?
    Sorry, my mistake! Doh!
    Offline

    11
    ReputationRep:
    No, you didn't make a mistake. It's the inverse. f(x-3) moves 3 to the right, f(x+3) moves 3 to the left.

    EDIT: Oh, I see now. I hate the simplification of formulas like that.
    Offline

    0
    ReputationRep:
    Haven't you done your non-calculator paper? Surely these should only come up on that...hmm...i hope so anyway cos i don't know it and i've got calculator tomorrow!!
 
 
 
Turn on thread page Beta
Updated: June 14, 2005
The home of Results and Clearing

3,001

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Do you want your parents to be with you when you collect your A-level results?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.