The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

Maths C4 question help

Right I've only just started this topic so sorry if I'm missing something really obvious here.

Find the turning point of the curve x=t, y= t^2 -1

ive firstly subbed in x for where t is (this probsbly doesn't make any difference) y= x^2 -1

dy/dx = 2x

Now what?

Thanks for any help
Reply 1
Avatar for TenOfThem
TenOfThem
18
Original post by RSmith1007
Right I've only just started this topic so sorry if I'm missing something really obvious here.

Find the turning point of the curve x=t, y= t^2 -1

ive firstly subbed in x for where t is (this probsbly doesn't make any difference) y= x^2 -1

dy/dx = 2x

Now what?

Thanks for any help


as with any turning point set the differential = 0
Reply 2
Avatar for RSmith1007
RSmith1007
OP
10
Original post by TenOfThem
as with any turning point set the differential = 0

But then y=-1 which is not whats in the answer book

thanks for your reply btw.
Reply 3
Avatar for TenOfThem
TenOfThem
18
Original post by RSmith1007
But then y=-1 which is not whats in the answer book

thanks for your reply btw.


then the answer book is incorrect
Reply 4
Avatar for RSmith1007
RSmith1007
OP
10
(1/2, -3/4) is the answer
Reply 5
Avatar for RSmith1007
RSmith1007
OP
10
Original post by TenOfThem
then the answer book is incorrect

Hmm ok, is there not some sort of different process for this due to this topic being about parametric and Cartesian equation. If not then you must be right.
Reply 6
Avatar for TenOfThem
TenOfThem
18
Original post by RSmith1007
(1/2, -3/4) is the answer


Not to the question in the OP it isn't
Reply 7
Avatar for TenOfThem
TenOfThem
18
Original post by RSmith1007
Hmm ok, is there not some sort of different process for this due to this topic being about parametric and Cartesian equation. If not then you must be right.


There is certainly more than one approach but they all give the same answer (0,-1)
Reply 8
Avatar for RSmith1007
RSmith1007
OP
10
Original post by TenOfThem
There is certainly more than one approach but they all give the same answer (0,-1)

Ok thanks for the help

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you