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    I'm having some trouble with understanding question 6b on this paper http://www.madasmaths.com/archive/iy...apers/c3_a.pdf I don't think I've ever come across a question like this before where you have to sketch y=f(ax +a)

    I stretched the curve by scale factor 1/2 then translated it two units in the negative x direction, but in the mark scheme it says to do this the other way around. Can anyone clearly explain why you have to do it the other way around? Also, could this question be on an Edexcel C3 paper?

    Thanks
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    (Original post by anonwinner)
    I'm having some trouble with understanding question 6b on this paper http://www.madasmaths.com/archive/iy...apers/c3_a.pdf I don't think I've ever come across a question like this before where you have to sketch y=f(ax +a)

    I stretched the curve by scale factor 1/2 then translated it two units in the negative x direction, but in the mark scheme it says to do this the other way around. Can anyone clearly explain why you have to do it the other way around? Also, could this question be on an Edexcel C3 paper?

    Thanks
    you can do it both ways
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    It is a translation by vector  \displaystyle \begin{pmatrix} -2 \\ 0 \end{pmatrix} followed by a stretch parallel to the x-axis by scale factor 1/2.

    OR
    It is a stretch by SF 1/2 followed by translation by vector  \begin{pmatrix} -1 \\ 0 \end{pmatrix} .
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    (Original post by B_9710)
    It is a translation by vector  \displaystyle \begin{pmatrix} -2 \\ 0 \end{pmatrix} followed by a stretch parallel to the x-axis by scale factor 1/2.

    OR
    It is a stretch by SF 1/2 followed by translation by vector  \begin{pmatrix} -1 \\ 0 \end{pmatrix} .
    what a "geezer "you are !!
    (Zacken might get jealous ...)
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    (Original post by TeeEm)
    what a "geezer "you are !!
    (Zacken might get jealous ...)
    Integrals at dawn will settle this.
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    (Original post by TeeEm)
    what a "geezer "you are !!
    (Zacken might get jealous ...)

    :cool:
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    (Original post by 16Characters....)
    Integrals at dawn will settle this.
    my money on Zacken ... he will ban people rather than lose
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    (Original post by B_9710)
    It is a translation by vector  \displaystyle \begin{pmatrix} -2 \\ 0 \end{pmatrix} followed by a stretch parallel to the x-axis by scale factor 1/2.

    OR
    It is a stretch by SF 1/2 followed by translation by vector  \begin{pmatrix} -1 \\ 0 \end{pmatrix} .
    Okay thanks. So basically if you choose to do the stretch first you have to also stretch the translation?
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    (Original post by anonwinner)
    Okay thanks. So basically if you choose to do the stretch first you have to also stretch the translation?
    Precisely.
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    (Original post by B_9710)
    Precisely.
    Do you know if this could come up in an Edexcel C3 paper? I have done all the past papers and haven't found it yet.

    Thanks for your help bro
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    (Original post by anonwinner)
    Do you know if this could come up in an Edexcel C3 paper? I have done all the past papers and haven't found it yet.

    Thanks for your help bro
    It could (I believe). It is composite transformations if you want to take a further look into it.
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    (Original post by anonwinner)
    Do you know if this could come up in an Edexcel C3 paper? I have done all the past papers and haven't found it yet.

    Thanks for your help bro
    Under the current spec the answer is no !
    These papers follow the EDEXCEL SYLLABUS (closely) but they are not Edexcel Past Papers
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    (Original post by TeeEm)
    Under the current spec the answer is no !
    These papers follow the EDEXCEL SYLLABUS (closely) but they are not Edexcel Past Papers
    Really? Only single transformations in edexcel?
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    (Original post by B_9710)
    Really? Only single transformations in edexcel?
    No but the double transformations involved are independent, i .e one on the x direction and one on the y direction, so even my cats can do them ...
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    (Original post by TeeEm)
    Under the current spec the answer is no !
    These papers follow the EDEXCEL SYLLABUS (closely) but they are not Edexcel Past Papers
    How dare you waste my precious time with irrelevant questions on your paper
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    (Original post by anonwinner)
    How dare you waste my precious time with irrelevant questions on your paper
    How long did you lose?
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    (Original post by TeeEm)
    How long did you lose?
    16
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    (Original post by anonwinner)
    16
    16 what?
    toy soldiers?
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    (Original post by TeeEm)
    No but the double transformations involved are independent, i .e one on the x direction and one on the y direction, so even my cats can do them ...
    Interesting. I wonder why that is. You'd think there would be a slight step up from the transformations in C2.
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    (Original post by B_9710)
    Interesting. I wonder why that is. You'd think there would be a slight step up from the transformations in C2.
    obvious "cheating" among the boards
    you can do triple maths and you will never see or tested on this
 
 
 
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