You are Here: Home >< Maths

# Partial fractions maths! watch

1. Please help. I need to find the B term so I did comparing coffcients for it. So that's 12=B but that's not right

SeanFM Math 123 Maths (2x2) Life
2. (Original post by Jane122)
Michiyo
Where is the working for B? Which coefficients are you comparing to 12x?
3. (Original post by Muttley79)
Where is the working for B? Which coefficients are you comparing to 12x?
I can Only compare the x terms to B and that's B therefore B=12
4. (Original post by Jane122)
I can Only compare the x terms to B and that's B therefore B=12
Check the LHS again ... you have a pair of brackets there.
5. 4a + b =12
6. (Original post by Muttley79)
Checj the LHS again ... you have a pair of brackets there.
But I can't use that can I? It would have an x^2 term in it
7. (Original post by Hamzah249)
4a + b =12
Where's the 4a from?
8. You're comparing the coefficients wrong. You can't simply compare A as the coefficient of the x to the power 2!

Try again but completely open all the brackets and expand the equation then compare the coefficients. Hope this helps 😊
9. (Original post by Hamzah249)
....
10. (Original post by Jane122)
Where's the 4a from?
simplify A(x+2)(x+2) and you will see that it's not just B thats the coefficient of x.

Also a tip, if comparing coefficients seems a bit confusing, you can always take any value of x to find the final constant. Take value such as x=1 or 2.
11. (Original post by Jane122)
Where's the 4a from?
There are x terms when you expand the brackets on the LHS
12. (Original post by Student1256)
You're comparing the coefficients wrong. You can't simply compare A as the coefficient of the x to the power 2!

Try again but completely open all the brackets and expand the equation then compare the coefficients. Hope this helps 😊
I never compared A , I already know you can't do that cause it's to the power of 2. So no , you didn't help.
13. (Original post by Muttley79)
I guess I should have only asked him to simplify A(x+2)(x+2)
14. (Original post by Hamzah249)
simplify A(x+2)(x+2) and you will see that it's not just B thats the coefficient of x.

Also a tip, if comparing coefficients seems a bit confusing, you can always take any value of x to find the final constant. Take value such as x=1 or 2.
A better choice is usually x = 0.

15. (Original post by Hamzah249)
simplify A(x+2)(x+2) and you will see that it's not just B thats the coefficient of x.

Also a tip, if comparing coefficients seems a bit confusing, you can always take any value of x to find the final constant. Take value such as x=1 or 2.
I swear nobody on this thread bothered to look AT THE PIC. I've done substituting already and I need to do comparing coefficients to find the B term cause you can't do substation. Also, would it be 2A then? Not 4a?
16. (Original post by Jane122)
I never compared A , I already know you can't do that cause it's to the power of 2. So no , you didn't help.
Have you found your error yet?
17. (Original post by Jane122)
I swear nobody on this thread bothered to look AT THE PIC. I've done substituting already and I need to do comparing coefficients to find the B term cause you can't do substation. Also, would it be 2A then? Not 4a?
I don't know why you are getting all worked up on those trying to help you, we did look at the picture maybe you need to read what we said?
18. (Original post by Muttley79)
Have you found your error yet?
No, nobody is helping I don't understand

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: January 18, 2017
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

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