Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter
    Offline

    3
    ReputationRep:
    In the attachment below this is given
    (in the "where things can go ugly" section)
    Blindly multiplying the two denominators when there might be a common factor, e.g. (𝑥+3)(𝑥−3) and (𝑥+3) should become (𝑥+3)(𝑥−3) rather than (𝑥+3)²(𝑥−3).

    But surely multiplying
    (x+3)(x-3) by (x+3) would give (x-3)²(x-3)????
    Attached Images
  1. File Type: pdf C3CheatSheet.pdf (418.4 KB, 106 views)
    Offline

    6
    ReputationRep:
    If you're adding 2 fractions, say \frac{A}{(x+3)(x-3)} + \frac{B}{x+3} then you're going to end up with \frac{A(x+3)+B(x+3)(x-3)}{x+3}{x-3}{x+3} which is unnecessary because there's a common factor of (x+3) in the fraction. So it just ends up as
    Unparseable or potentially dangerous latex formula. Error 4: no dvi output from LaTeX. It is likely that your formula contains syntax errors or worse.
    \frac{A+B(x-3)}{(x+3)(x-3)



    fml.. Latex is broken at the moment I think.

    edit:
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Parallex)
    If you're adding 2 fractions, say \frac{A}{(x+3)(x-3)} + \frac{B}{x+3} then you're going to end up with \frac{A(x+3)+B(x+3)(x-3)}{x+3}{x-3}{x+3} which is unnecessary because there's a common factor of (x+3) in the fraction. So it just ends up as \frac{A+B(x-3)}{(x+3)(x-3)}


    fml.. Latex is broken at the moment I think.

    edit:
    But the question is ....
    oh i forgot the definition of denominator xD silly me thanks anyway
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: June 9, 2016
Poll
Do I go to The Streets tomorrow night?
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.