You are Here: Home >< Maths

Higher Maths- The Circle

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. Can someone please help me? Find the values of k for which the line y=x+k is a tangent to the circle x^2+y^2=5.
I have substituted the line into the circle equation then tried doing the discriminant but it hasn't worked as the answer is k =−10 10 square rooted.
2. (Original post by sabrinaclark23)
Can someone please help me? Find the values of k for which the line y=x+k is a tangent to the circle x^2+y^2=5.
I have substituted the line into the circle equation then tried doing the discriminant but it hasn't worked as the answer is k =−10 10 square rooted.
Try again. You should get from the discriminant.

Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: August 12, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read here first

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants