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as the focus is below the directrix then the graph is concave down. line of symmetry is x=4. |dw:1443884034227:dw| distance between the focus and directrix is 2 multiplied by the focal length. distance is 2b = -10 => focal length is b = -5 units vertex is (4. 3 - (-5)) => (4. 8) (x^2−h)=4a(y−k) (x−4^)2=4*(−5)(y−8) now simplify all this and get your equation
woops mistake wait
this is correct distance between the focus and directrix is 2 multiplied by the focal length. distance is 2b = -10 => focal length is b = -5 units vertex is (4. 3 - (-5)) => (4. 8) (x^2−h)=4b(y−k) (x−4)^2=4*(−5)(y−8) now simplify all this and get your equation
so do you simplify both of it?
not both you simplify this equation (x−4)^2=4*(−5)(y−8)
= −one twentieth (x − 4)2 + 8
yes i think so
though i could have made a mistake
ok these are thhe my options hold on
the second one as you see
other two options are same as these two but without - 20
Alright thx for the help and do you think you can help with another similar problem plz?
i will try but i'm not sure i will do it