Potterhead999
Badges: 11
Rep:
?
#1
Report Thread starter 4 years ago
#1
Please could somebody please help to find the range of values for which the following expression is valid:
4/(1+2x) - 2/(1-x) + 3/(1-x)^2
0
reply
B_9710
Badges: 17
Rep:
?
#2
Report 4 years ago
#2
Find the range of x values that each of the three separate expansions are valid for, then take the strictest region. For the full expansion to be valid, all of the sub expansions (not a real maths term but you know what I mean) must be valid.
0
reply
Potterhead999
Badges: 11
Rep:
?
#3
Report Thread starter 4 years ago
#3
(Original post by B_9710)
Find the range of x values that each of the three separate expansions are valid for, then take the strictest region. For the full expansion to be valid, all of the sub expansions (not a real maths term but you know what I mean) must be valid.
thanks
0
reply
MathsSir
Badges: 1
Rep:
?
#4
Report 4 years ago
#4
mag x < 1/2
0
reply
B_9710
Badges: 17
Rep:
?
#5
Report 4 years ago
#5
In fact if you have a function similar to the one you have above  f(x)=f_1(x)+f_2(x)+\ldots +f_n(x) (say) and  f_1, f_2,\ldots ,f_n are valid if  x is an element of the set  A_1, A_2, \ldots , A_n respectively then the expansion is only valid if and only if  x\in \bigcap _{j=1}^n A_j .
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

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.

Personalise

Which of these would you use to help with making uni decisions?

Webinars (32)
13.91%
Virtual campus tours/open days (50)
21.74%
Live streaming events (22)
9.57%
Online AMAs/guest lectures (23)
10%
A uni comparison tool (53)
23.04%
An in-person event when available (50)
21.74%

Watched Threads

View All
Latest
My Feed