Parametrics (1 Viewer)

[Bdogz]

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<!-- google_ad_section_start -->When it says determine the cartesian equation of the locus etc.. is it ok if u just leave it as say x^2=4ay or do u hv to say with vertex (0,0) and focus (0,a)

Example: show that T is constrained to move on a parabola,
the answer becomes x^2=4 * a/2(y+a) then the answer sed: this is the equation of a parabola, with vertex (0,-a) and focus (0, -a/2)

Will you get full marks if u jsut rite x^2=4 * a/2(y+a)?

thnks

 

[emmcyclopedia]

No - I'm pretty sure you have to also state the vertex and focus.
We had a question like this in our trials and some people lost a mark for not mentioning them, even though the question didn't explicitly state that you had to show these co-ordinates.
Either way, it's only one line, and it doesn't hurt to put it in there =]

 

[Bdogz]

No - I'm pretty sure you have to also state the vertex and focus.
We had a question like this in our trials and some people lost a mark for not mentioning them, even though the question didn't explicitly state that you had to show these co-ordinates.
Either way, it's only one line, and it doesn't hurt to put it in there =]

oh k, thnx 4 letting me know

 

[Aquawhite]

Tough one. I'll ask my teacher tomorrow (going into school tomorrow )

 

[kwabon]

<hr style="background-color: rgb(209, 209, 225); color: rgb(209, 209, 225);" size="1">
<!-- google_ad_section_start -->When it says determine the cartesian equation of the locus etc.. is it ok if u just leave it as say x^2=4ay or do u hv to say with vertex (0,0) and focus (0,a)

Example: show that T is constrained to move on a parabola,
the answer becomes x^2=4 * a/2(y+a) then the answer sed: this is the equation of a parabola, with vertex (0,-a) and focus (0, -a/2)

Will you get full marks if u jsut rite x^2=4 * a/2(y+a)?

thnks

you will get full marks,

unless it asks for specifics, such as, "mention important points of the locus", only then ramble about the vertex and focus and what not.