Another question from me.

The curve C has equation .

The Points P and Q lie on C and have x-coordinates 1 and 2 respectively.

a) Show that the length of PQ is .

b) Show that the tangents to C at P and Q are parallel.

c) Find an equation for the noram to C at p giving your answer in the form

No idea where to start with this equation the on the end really confuses me too, haven't seen that before.