You are Here: Home >< Maths

# HELP PLEASE f(x)= x^2+2x+5 watch

1. Hey everybody,
i have a homework for tomorrow, and i really appreciate if someane could help me ! please
f(x)=x^2+2x+5 we have to found the a & b in f(x)=(x+a)^2+b
2. (Original post by Mathious)
Hey everybody,
i have a homework for tomorrow, and i really appreciate if someane could help me ! please
f(x)=x^2+2x+5 we have to found the a & b in f(x)=(x+a)^2+b
Do you know how to complete the square?
3. (Original post by MathQ123)
Do you know how to complete the square?
(x+1)+4
4. (Original post by MathQ123)
Do you know how to complete the square?
yes i mean
5. (Original post by didge47)
(x+1)+4
How did you found it ?
6. (Original post by Mathious)
No, i don't have any ideas about it
I'll give you an example

F(x)= x^2 + 6x + 5
This can be written as
F(x)=( x + 6/2)^2 +c
=(x+3)^2 +c
=(x^2 +6x+9) - 4 (to get the +5 in the original)

which is f(x)=(x+3)^2 -4

Use the same method to find your answer. Let me know if you don't understand anything.
7. (Original post by MathQ123)
I'll give you an example

F(x)= x^2 + 6x + 5
This can be written as
F(x)=( x + 6/2)^2 +c
=(x+3)^2 +c
=(x^2 +6x+9) - 4 (to get the +5 in the original)

which is f(x)=(x+3)^2 -4

Use the same method to find your answer. Let me know if you don't understand anything.
I did it ! thank you so much ahah

### Related university courses

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: November 2, 2015
Today on TSR

### Edexcel GCSE Maths Unofficial Markscheme

Find out how you've done here

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