You are Here: Home >< Maths

# what does 'equal roots' mean? Watch

1. i'm sure this has been asked before, but i cannot get the search to work.
it's a c1 question where f(x) has equal roots. help appreciated.

2. If the function f(x) is a quadratic or has a power higher than 1, there are two roots. Both of these roots are therefore equal.

for example, the roots of
x^2 + 6x +9

are x = 3
and x = 3
- equal roots
3. b^2-4ac = 0
4. Ok, thanks.
5. Basically the graph of the function touches the x axis but doesn't cross it
6. (Original post by Mithra)
Basically the graph of the function touches the x axis but doesn't cross it
Although it can be useful to consider a geometric interpretation, this is a graph of a function with equal roots.
7. (Original post by harr)
Although it can be useful to consider a geometric interpretation, this is a graph of a function with equal roots.
doh, forgot about graphs like that . I was just thinking of a quadratic moved upwards since someone mentioned quadratic roots formula .

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:
Updated: February 2, 2009
Today on TSR

Can it be done?

### Give feedback to Cambridge here

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE