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Rectangular hyperbola coordinates

Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?
Original post by RonnieRJ
Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?


Can you post a photo?
Reply 2
Avatar for rxns_00
rxns_00
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Original post by BarryBeTrippin
Can you post a photo?

image.jpg
Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?
Original post by RonnieRJ
image.jpg
Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?


Yeah it's an error my book has the coordinates at (ct, c/t)
Reply 4
Avatar for rxns_00
rxns_00
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Original post by BarryBeTrippin
Yeah it's an error my book has the coordinates at (ct, c/t)


Ah ok thank youuu :smile:
Reply 5
Avatar for Zacken
Zacken
22
Original post by RonnieRJ
Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?


Mistake in the textbook, a quick check in your formula booklet will confirm this.
Reply 6
Avatar for Ayman!
Ayman!
15
Original post by RonnieRJ
image.jpg
Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?


You're right - it's ct, not ct^2.
Reply 7
Avatar for rxns_00
rxns_00
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Original post by Zacken
Mistake in the textbook, a quick check in your formula booklet will confirm this.


Ooh didn't realise this was given in the formula booklet

Thank you! :smile:
Lol are u working on the floor??
Reply 9
Avatar for davros
davros
16
Original post by RonnieRJ
image.jpg
Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?


You have to trust your judgement on this - you want a cartesian equation xy = c^2 and the book's version doesn't work with the coordinates they've given so you are right :smile:
Reply 10
Avatar for rxns_00
rxns_00
OP
15
Original post by davros
You have to trust your judgement on this - you want a cartesian equation xy = c^2 and the book's version doesn't work with the coordinates they've given so you are right :smile:

Yeah I checked it with the Cartesian form but then I wondered if the equation they gave was wrong!

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