Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    Heinemann Edexcel P6. Ex 1A Q 15

    First 3 non-zero terms in the expansion of e(x²-x)

    Book has

    1 + x - (1.5).x² ...

    I have

    1 - x + (1.5).x² ...

    :confused:

    Aitch
    Offline

    0
    ReputationRep:
    (Original post by Aitch)
    Heinemann Edexcel P6. Ex 1A Q 15

    First 3 non-zero terms in the expansion of e(x²-x)

    Book has

    1 + x - (1.5).x² ...

    I have

    1 - x + (1.5).x² ...

    :confused:

    Aitch
    I get what you get, The book seems wrong
    You can check, this by substituting values in e(x²-x) and substitute values in your expansion and in the books expansion, compare all the values, you'll find that your expansion is right.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Vijay1)
    I get what you get, The book seems wrong
    You can check, this by substituting values in e(x²-x) and substitute values in your expansion and in the books expansion, compare all the values, you'll find that your expansion is right.
    I've tried some small values for x, and what I've got does give closer results.

    Thanks for your help.

    Aitch
 
 
 
Turn on thread page Beta
Updated: July 1, 2005

2,209

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
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.