Question on parabolas

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

http://store.aqa.org.uk/qual/gce/pdf/AQA-MFP1-W-QP-JUN10.PDF

as I havent encountered this type of Question before.

Cheers.

Put one end of your ruler on (-2,0) and rotate it until it is tangent to the parabola.

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.

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.

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?

Yeah thats I've drawn. So Im assuming it would be correct?

Yep!

Original post by ghostwalker

Yep!

Alright cheers.

How to revise for GCSE Maths: AQA explains what to do

How to revise for GCSE Business exams: AQA explains what to do

How to revise for A-level Maths exams: AQA explains what to do

How to revise for A-level Chemistry exams: AQA explains what to do