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Math Help - Stretch function

  1. #1
    Junior Member
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    Stretch function

    So I came across this question:

    y = f(9x), what does this do to the function y=f(x).

    It multiplies the x value by 9 correct? Therefore, stretching the horizontal axis by 9? I put that and it said it was incorrect.

    Is that even right? Or is there other stuff that happens?
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  2. #2
    MHF Contributor Calculus26's Avatar
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    In General for f(ax) if a >1 f(x) is compressed horizontaly

    a< 1 f(x) is stretched horizontaly

    See attachment for examples
    Attached Thumbnails Attached Thumbnails Stretch function-stretx.jpg  
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  3. #3
    Junior Member
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    Yeah, now that I actually think about it, I knew it all along. I guess actually doing some graphing when asked graphing questions wouldn't hurt :P

    Thanks!
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