You are Here: Home >< Maths

# some partial fractions and binomial expansions questions.. watch

1. The question is
express 3(x+1)
(x+2)(x-1)
x ER x isnt -2, x isnt 1 )the equals with a dash through!)
so i gotL
1/(x+2) + 2/(x-1)
Part b says hence or otherwise prove that f'(x)<0 for all values of x in the domain. ...what do i do here? I know i differentiate but the what?
------
Find the first 3 terms in the expansion
(x+4)
(1+3x)^2

so i expanded (1+3x)^2 but now have:
(x+4)(1-6x+27x^2-108x^3)
what do i do? multiply them together?
Thanks
xxx
2. (Original post by indie_couture)
The question is
express 3(x+1)
(x+2)(x-1)
x ER x isnt -2, x isnt 1 )the equals with a dash through!)
so i gotL
1/(x+2) + 2/(x-1)
Part b says hence or otherwise prove that f'(x)<0 for all values of x in the domain. ...what do i do here? I know i differentiate but the what?
------
Find the first 3 terms in the expansion
(x+4)
(1+3x)^2

so i expanded (1+3x)^2 but now have:
(x+4)(1-6x+27x^2-108x^3)
what do i do? multiply them together?
Thanks
xxx
I suggest you try and use latex.

You should not have expanded what you should have expanded was and then multiply by
3. (Original post by steve2005)
I suggest you try and use latex.

You should not have expanded what you should have expanded was and then multiply by
i meant i did expand that, so i just multiply, yes? xxx
4. (Original post by indie_couture)
i meant i did expand that, so i just multiply, yes? xxx
Yes
5. i am sorry but i don't really don't understand what you're saying in your question OP
6. (Original post by indie_couture)
The question is
express 3(x+1)
(x+2)(x-1)
x ER x isnt -2, x isnt 1 )the equals with a dash through!)
so i gotL
1/(x+2) + 2/(x-1)
Part b says hence or otherwise prove that f'(x)<0 for all values of x in the domain. ...what do i do here? I know i differentiate but the what?
------
Find the first 3 terms in the expansion
(x+4)
(1+3x)^2

so i expanded (1+3x)^2 but now have:
(x+4)(1-6x+27x^2-108x^3)
what do i do? multiply them together?
Thanks
xxx
Hey where is this question from? and yes that is what you would do

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: October 9, 2016
Today on TSR

Will it ever be possible?

### University open days

1. University of Cambridge
Wed, 26 Sep '18
2. Norwich University of the Arts
Fri, 28 Sep '18
3. Edge Hill University
Faculty of Health and Social Care Undergraduate
Sat, 29 Sep '18
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