To answer the first question:

Plug in

into the original equation to find the y values.

This can be easily factored. You will get two y values, which I will denote as

and

respectively.

This will give you the two points:

and

Now, find the derivative [which you already did] and then plug these points into

. Each point will create a different slope,

and

, respectively.

Now to find the equations of the tangents, use the point slope form of a line. You will have two equations:

and

Can you take it from here?

--Chris