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# C3 transformation question

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Why bother with a post grad course - waste of time? 17-10-2016
1. Hey.
For transforming f(x) to f(2x + 10).
Would i be correct in saying that it is first a translation -10 units in the x direction then stretch scale factor 1/2 in the x direction?

thanks
2. (Original post by SamuelN98)
Hey.
For transforming f(x) to f(2x + 10).
Would i be correct in saying that it is first a translation -10 units in the x direction then stretch scale factor 1/2 in the x direction?

thanks
that is the order i would use.
3. (Original post by SamuelN98)
Hey.
For transforming f(x) to f(2x + 10).
Would i be correct in saying that it is first a translation -10 units in the x direction then stretch scale factor 1/2 in the x direction?

thanks
Edit: ignore what I wrote before. There was a tutorial I watched a while ago with trig graphs, it explains it well. https://www.youtube.com/watch?v=Isx6gM36szY
4. (Original post by SamuelN98)
Hey.
For transforming f(x) to f(2x + 10).
Would i be correct in saying that it is first a translation -10 units in the x direction then stretch scale factor 1/2 in the x direction?

thanks
It's not -10 units in the x direction, since we have the following:
y = f(x)
g(x) = f(2x)
g(x+5) = f(2(x+5)) = f(2x+10)

So we stretch by a scale factor of 1/2 in x direction, then translate -5 in the x direction
5. What about f(x) to f(3x+9) ? SF 1/3 in x direction translation (-3,0)
6. (Original post by theboss1998)
I am quite sure that you should apply the translation first because if you have coordinate (20,0) then you move the point to the left by 10 then divide by 2 so it becomes 5. If you stretch first, it will be 10 then move it to the left by 10 which makes it 0, thats wrong!
What makes you think it's wrong? Look at what ccharlie97 wrote.

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