utv
Badges: 14
Rep:
?
#1
Report Thread starter 2 years ago
#1
I'm really confused on how to answer this question as we haven't been taught it but been given it for homework can anyone help

Name:  IMG_20181106_195314-compressed.jpg.jpeg
Views: 68
Size:  150.9 KB
0
reply
mqb2766
Badges: 19
Rep:
?
#2
Report 2 years ago
#2
(Original post by utv)
I'm really confused on how to answer this question as we haven't been taught it but been given it for homework can anyone help

Name:  IMG_20181106_195314-compressed.jpg.jpeg
Views: 68
Size:  150.9 KB
I guess you have been taught about the binomial expansion?
If so, work out which powers will give x^3 and x^6. What is the power of the first term, second term, ... you should be able to do it.
If you've not covered the binomial expansion, ask your teacher?

Edit: is a reasonable overview
https://revisionmaths.com/advanced-l...inomial-series
Last edited by mqb2766; 2 years ago
0
reply
utv
Badges: 14
Rep:
?
#3
Report Thread starter 2 years ago
#3
I've covered binomial expansion and working out the coficient but not like this. may you help? usually if I want to work out coficient of x^4 in ,(2x-3)^5 you would

do do (2x)^4 × 5choose1 ×-3 then again to work out coficient but it's more confusing
0
reply
mqb2766
Badges: 19
Rep:
?
#4
Report 2 years ago
#4
(Original post by utv)
I've covered binomial expansion and working out the coficient but not like this. may you help? usually if I want to work out coficient of x^4 in ,(2x-3)^5 you would

do do (2x)^4 × 5choose1 ×-3 then again to work out coficient but it's more confusing
The binomial is generally (a b)^n where in this case
a = x^2
b = -1/2x
n = 6
So what is the first term, second term, and then once you've sharpened your skills do the x^3 term and the x^6 term?
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

Poll: What factors affect your mental health most right now? Post-lockdown edition

Anxiousness about restrictions easing (48)
5.94%
Uncertainty around my education (92)
11.39%
Uncertainty around my future career prospects (83)
10.27%
Lack of purpose or motivation (103)
12.75%
Lack of support system (eg. teachers, counsellors, delays in care) (40)
4.95%
Impact lockdown had on physical health (45)
5.57%
Social worries (incl. loneliness/making friends) (89)
11.01%
Financial worries (54)
6.68%
Concern about myself or my loves ones getting/having been ill (37)
4.58%
Exposure to negative news/social media (51)
6.31%
Difficulty accessing real life entertainment (25)
3.09%
Lack of confidence in making big life decisions (77)
9.53%
Worry about missed opportunities during the pandemic (64)
7.92%

Watched Threads

View All