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vertex (3,5)

we have formula to figure out the focus and directrix. temporarily cannot remember. let me check

yes. focus (3,10)

how did you get that?

to get vertex, you isolate y, take y', let y'=0 to get x, y of the vertex

to get focus, you have formula x^2 =4py, your x is (x-3) your y = y-5---> p =10

the directrix is y =-p = -10

I think so. check your answer book. long time , i may not be right.

thanks a lot :)

you 're welcome