Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    I get how to use the different rules however I'm not sure what the heck is going on when I need to factorise my expression. For example:

    4x2(2x+1)50 + 2x(2x+1)51

    It apparently simplifies to:

    x(2x+1)50(4x+1)

    HOW?!

    (See attachment for better layout of questions)

    Please help me
    Attached Images
     
    • Community Assistant
    • Study Helper
    Offline

    20
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by lucaT)
    I get how to use the different rules however I'm not sure what the heck is going on when I need to factorise my expression. For example:

    4x2(2x+1)50 + 2x(2x+1)51

    It apparently simplifies to:

    x(2x+1)50(4x+1)

    HOW?!

    (See attachment for better layout of questions)

    Please help me
    Think back to when you first learnt how to factorise:

    4x^2(2x+1)^{50} + 2x(2x+1)^{51}

    What are the common factors of each of the two terms? You can take these "outside the bracket".


    If you're still unsure, try factorising this

    4x^2y^{50} + 2xy^{51}

    then realise that y=(2x+1). Please post all your working if you get stuck.
    Offline

    21
    ReputationRep:
    (Original post by Notnek)
    Think back to when you first learnt how to factorise:

    4x^2(2x+1)^{50} + 2x(2x+1)^{51}

    What are the common factors of each of the two terms? You can take these "outside the bracket".


    If you're still unsure, try factorising this

    4x^2y^{50} + 2xy^{51}

    then realise that y=(2x+1). Please post all your working if you get stuck.
    I do believe there's a mistake. I think should be 2x(4x+1)(2x+1)^{50}
    • Community Assistant
    • Study Helper
    Offline

    20
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by Desmos)
    I do believe there's a mistake. I think should be 2x(4x+1)(2x+1)^{50}
    Oops I didn't notice the mistake. This could be why the OP is confused.

    Thanks
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Notnek)
    Think back to when you first learnt how to factorise:

    4x^2(2x+1)^{50} + 2x(2x+1)^{51}

    What are the common factors of each of the two terms? You can take these "outside the bracket".


    If you're still unsure, try factorising this

    4x^2y^{50} + 2xy^{51}

    then realise that y=(2x+1). Please post all your working if you get stuck.
    Thank you, I'm using 4x^2y^{50} + 2xy^{51} if I get too stuck now
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 9, 2017

University open days

  1. Norwich University of the Arts
    Postgraduate Open Days Postgraduate
    Thu, 19 Jul '18
  2. University of Sunderland
    Postgraduate Open Day Postgraduate
    Thu, 19 Jul '18
  3. Plymouth College of Art
    All MA Programmes Postgraduate
    Thu, 19 Jul '18
Poll
How are you feeling in the run-up to Results Day 2018?
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.