Join TSR now and get all your revision questions answeredSign up now

[Maths] - Algebra

Announcements
    • Thread Starter
    Offline

    3
    ReputationRep:
    Name:  Capture.PNG
Views: 21
Size:  7.1 KBCan someone explain to me what was done in the picture below?
    Offline

    3
    ReputationRep:
    (Original post by AdeptDz)
    Name:  Capture.PNG
Views: 21
Size:  7.1 KBCan someone explain to me what was done in the picture below?
    A factor of \frac{n(n+1)}{4} has been pulled out.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by NotNotBatman)
    A factor of \frac{n(n+1)}{4} has been pulled out.
    Ohh I see, thanks
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by NotNotBatman)
    A factor of \frac{n(n+1)}{4} has been pulled out.
    Am i suppose to be able to spot factors like that because i dont usually check for factors first, I think that is a bad habit, If I attempted that, which I did first thing I would of done was take a factor of n/4 then expand the terms inside the big bracket. Im guessing that would give me the correct answer but not in the form the book wants it
    Offline

    3
    ReputationRep:
    (Original post by AdeptDz)
    Am i suppose to be able to spot factors like that because i dont usually check for factors first, I think that is a bad habit, If I attempted that, which I did first thing I would of done was take a factor of n/4 then expand the terms inside the big bracket. Im guessing that would give me the correct answer but not in the form the book wants it
    You could do that, but it's easier to factorise as you don't have to deal with high degrees of n. Factorise everything that is common. When I'm doing a question like that I carefully consider each factor and see if they are common, if they are, then factorise it out.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by NotNotBatman)
    You could do that, but it's easier to factorise as you don't have to deal with high degrees of n. Factorise everything that is common. When I'm doing a question like that I carefully consider each factor and see if they are common, if they are, then factorise it out.
    Cool thanks for the help, I will try and make it a habit to always check for the highest common factor
 
 
 
Poll
Do you have exam superstitions?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.