Hey! Sign in to get help with your study questionsNew here? Join for free to post

Chain rule

Announcements Posted on
Uni student? You could win a Samsung Galaxy S7 or £500 of travel vouchers by taking this quick survey 05-05-2016
Talking about ISA/EMPA specifics is against our guidelines - read more here 28-04-2016
  1. Offline

    ReputationRep:
    Differentiate w.r.t x
    (2+x)^3(2-x)^3

    i firstly made them into one
    so I got
    (4-x^2)^6

    did the chain rule the long way and got

    -12(4-x^2)^5
    but the answer when I checked on wolframalpha is

    -6x(x^2-4)^2

    I think I went wrong with the indices part but not sure why it was wrong :s
  2. Offline

    ReputationRep:
    Do you mean:

     (2 + x)^3 \cdot (2 - x)^3 because it looks like:

     (2 + x)^{3(2 - x)^{3}}

    If it is, then simplifying will give you:

     ((2 + x) \cdot (2 - x))^3 = (4 - x^2)^3

    not to the power of 6.

    Remember:  (a\cdot b)^x = a^x \cdot b^x
  3. Offline

    ReputationRep:
    (Original post by 0range)
    Differentiate w.r.t x
    (2+x)^3(2-x)^3

    i firstly made them into one
    so I got
    (4-x^2)^6
    It should be (4-x^2)^3

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: April 4, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR
Poll
What should Britain's new polar research ship be called
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read here first

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