Turn on thread page Beta
    • Thread Starter
    Offline

    14
    ReputationRep:
    Say a question asks (in general):

    Find the term that is independant of x in the expression:

    (a + bx)^m + (c + dx)^n

    Is there any fast way to do this, or do you just have to multiply everything out 'manually', add them together and look for the constant?

    What if n and m are very high?
    Offline

    0
    ReputationRep:
    I believe you are refering to question in the Edexcel P2 paper sat on Monday.

    In the first part it asked you to work out the first 4 terms, and you could see a pattern; the X powers decreased by 4 each term (or something like that), so it was possible to see which power created the constant. In the P2 paper the power was 9 (I think). By using this it save doing all the working .

    If you were not refering to the question, then just follow the same principle.

    Jow
    Offline

    2
    ReputationRep:
    (Original post by mik1a)
    Say a question asks (in general):

    Find the term that is independant of x in the expression:

    (a + bx)^m + (c + dx)^n

    Is there any fast way to do this, or do you just have to multiply everything out 'manually', add them together and look for the constant?

    What if n and m are very high?
    I'm not sure what you mean, but if you're talking about finding the constant (ie coefficient of x^0) it's just (a^m + c^n)
 
 
 
Turn on thread page Beta
Updated: June 23, 2004

University open days

  1. University of Cambridge
    Christ's College Undergraduate
    Wed, 26 Sep '18
  2. Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 28 Sep '18
  3. Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 29 Sep '18
Poll
Which accompaniment is best?
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

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