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Math Help - Clarification on shifting functions - on x and y axis

  1. #1
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    Clarification on shifting functions - on x and y axis

    Hi

    I understand that a vertical stretch, ie a stretch on y axis is y = af(x) and a horizontal stretch, ie a stretch on the x axis is y=f(ax).

    and eg y=2sinx is an example of a vertical stretch and y=sin 2x is an example of a horizontal stretch. That's fine.

    But if I apply to a really simple example, eg y=x^2, then a vertical stretch would be:
    y=2x^2? Is that correct?

    But for a horizontal stretch y=(2x)^2?

    Angus
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