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# maths help watch

1. part a) only. mark scheme says stretch by sf 1/2? I said 1/4
2. If f(x) = x^2 then f(2x) = (2x)^2 = 4x^2, hence a horizontal stretch by sf 1/2. I think I would have been inclined to call it a vertical stretch by sf 4, though.
3. (Original post by old_engineer)
If f(x) = x^2 then f(2x) = (2x)^2 = 4x^2, hence a horizontal stretch by sf 1/2. I think I would have been inclined to call it a vertical stretch by sf 4, though.
ty, makes a lot more sense now!. I'm beginning to understand stretches although they have always confused me.

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Updated: February 8, 2018
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