Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    X
    ----- + 8 = 13
    2

    The answer is 10 but I get 18.
    I times both sides by 2 so X +8 =26
    Take 8 both sides so X = 18.

    What am I doing wrong?

    Also this one
    X
    ----- - 5 = 30
    2

    Answer is 40 but i get 35
    Offline

    16
    ReputationRep:
    (Original post by wartortle)
    X
    ----- + 8 = 13
    2

    The answer is 10 but I get 18.
    I times both sides by 2 so X +8 =26
    Take 8 both sides so X = 18.

    What am I doing wrong?

    Also this one
    X
    ----- - 5 = 30
    2

    Answer is 40 but i get 35
    You have to multiply everything by 2 to get rid of the denominator not just what is after the = sign
    So you would get x+16=26

    Do the same for the other one

    Edit: The answer isn't 40 for the second one.
    Offline

    14
    ReputationRep:
    (Original post by wartortle)
    X
    ----- + 8 = 13
    2

    The answer is 10 but I get 18.
    I times both sides by 2 so X +8 =26
    Take 8 both sides so X = 18.

    What am I doing wrong?

    Also this one
    X
    ----- - 5 = 30
    2

    Answer is 40 but i get 35
    it's 2 * (\dfrac{x}{2}+8)=2 * (13)
    Offline

    3
    ReputationRep:
    do the addition and subtraction before the multiplication and division, effectively reverse BIDMUS
    so x/2 + 8 = 13
    -8 from both sides
    x/2 = 5
    times both sides by 2
    x = 10.
    Offline

    14
    ReputationRep:
    (Original post by wartortle)
    X
    ----- + 8 = 13
    2

    The answer is 10 but I get 18.
    I times both sides by 2 so X +8 =26
    Take 8 both sides so X = 18.

    What am I doing wrong?

    Also this one
    X
    ----- - 5 = 30
    2

    Answer is 40 but i get 35
    for the second one it's 2*(\dfrac{x}{2}-5) = 2*(30) the answer should be 70.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by mightyfrog2_10)
    it's 2 * (\dfrac{x}{2}+8)=2 * (13)
    how do you type like that?
    Offline

    14
    ReputationRep:
    (Original post by wartortle)
    how do you type like that?
    it's quite easy you have to learn latex: http://www.thestudentroom.co.uk/wiki/LaTex
    so for fraction: \frac or to make the fraction clear use \dfrac
    for multiplication i should have used \times instead of * sorry
    you need to start of with [tex] then write everything in the middle and end with [/ t e x] (without spaces in the word tex here)

    do you know how to solve the questions above?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by mightyfrog2_10)
    it's quite easy you have to learn latex: http://www.thestudentroom.co.uk/wiki/LaTex
    so for fraction: \frac or to make the fraction clear use \dfrac
    for multiplication i should have used \times instead of * sorry
    you need to start of with [tex] then write everything in the middle and end with [/ t e x] (without spaces in the word tex here)

    do you know how to solve the questions above?
    Thank you.

    Yes I have now completed the question, thank you.
    Offline

    14
    ReputationRep:
    (Original post by wartortle)
    Thank you.

    Yes I have now completed the question, thank you.
    cool, no problem.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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