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# Question on parabolas watch

1. Hi there, alittle confused with what I have to do on Q 9 a) ii):

http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN10.PDF

as I havent encountered this type of Question before.

Cheers.
2. Put one end of your ruler on (-2,0) and rotate it until it is tangent to the parabola.
3. (Original post by Hopple)
Put one end of your ruler on (-2,0) and rotate it until it is tangent to the parabola.
lol Ive done this but how do you know if the two lines are tangents? Ive just drawn two straight lines that go either side of the parabola.
4. (Original post by marek35)
lol Ive done this but how do you know if the two lines are tangents? Ive just drawn two straight lines that go either side of the parabola.
Because they only touch the parabola, if you've drawn them correctly.
5. (Original post by ghostwalker)
Because they only touch the parabola, if you've drawn them correctly.
Yeah thats I've drawn. So Im assuming it would be correct?
6. (Original post by marek35)
Yeah thats I've drawn. So Im assuming it would be correct?
Yep!
7. (Original post by ghostwalker)
Yep!
Alright cheers.

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