we have the parabola in the canonical form:
Then, the directrix is:
I have two questions for which I have partial working for, but I am unsure of the working for them.
Find (a) the directrix, (b) the focus and (c) the roots of the parabola
Therefore x=4 and x=1.
I'm very certain of my answer for c), however I lost my working for a) and b) so I'm fairly certain that I am incorrect for those answers.
Show how you arrived at your graph by determining the x-intercepts, the extent of the graph and the asympotes.
A) I admit to being lost when it comes to this question, I know how to work these kind of questions under other situations where the x and y are reversed. E.g.: . I am very lost as to what to do with this one though.
When I try to determine 'c' I come out with
I don't really see how that can be correct.