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

really simple question

Announcements Posted on
At uni? What do you think of the careers support? 12-02-2016
How proud of your uni are you? Take our survey for the chance to win a holiday! 09-02-2016
  1. Offline

    ReputationRep:
    whilst working through a C4 paper as part of a question 2(x * 3/x1/2) = 6x1/2

    how is this possible please
  2. Offline

    ReputationRep:
    basically that is not clear but the question is asking you to square x + 3/x^1/2 and i can not get all the factors
    thankyou
  3. Offline

    ReputationRep:
    (Original post by rsp)
    whilst working through a C4 paper as part of a question 2(x * 3/x1/2) = 6x/x1/2

    how is this possible please
    2 \times \left(x \times \dfrac{3}{x^{\frac{1}{2}}}\right  ) = 2 \times \dfrac{3x}{x^{\frac{1}{2}}} = \dfrac{6x}{x^{\frac{1}{2}}} = (6x)(x^{-\frac{1}{2}}) = 6x^{1-\frac{1}{2}} = 6x^{\frac{1}{2}}
  4. Offline

    ReputationRep:
    (Original post by Igrisok)
    If the LHS is 2(x + 3)/(x^0.5), I'm getting x = 3 here. I don't think you have to square anything! Could you link to the question please?
    This isn't an equation to solve. The OP's asking how to get from the LHS to the RHS. Oh and it was x \times 3 not x + 3
  5. Offline

    ReputationRep:
    its okay now sorry its not very clear and i managed to work it out
  6. Offline

    ReputationRep:
    (Original post by Igrisok)
    Sorry, got a little confused by the second post... But getting from LHS to RHS is pretty simple, OP! It's just 2 * 3 after all :P
    Yeah don't worry so did I, I think the OP was trying to say they had to expand \left( x + \dfrac{3}{x^{\frac{1}{2}}} \right)^2 and were stuck on simplifying that part.

    The OP has since changed her target to 6x^{\frac{1}{2}} - so the indices themselves were the problem, I think.
  7. Offline

    ReputationRep:
    (Original post by hassi94)
    2 \times \left(x \times \dfrac{3}{x^{\frac{1}{2}}}\right  ) = 2 \times \dfrac{3x}{x^{\frac{1}{2}}} = \dfrac{6x}{x^{\frac{1}{2}}} = (6x)(x^{-\frac{1}{2}}) = 6x^{1-\frac{1}{2}} = 6x^{\frac{1}{2}}
    thanks that explained it perfect

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. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 2, 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

Find out who won!

TSR community awards 2015

Poll
Would you be influenced by unis giving flexible offers (so you can miss by a grade)?
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.