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

    2
    Give your solutions to 2 decimal places.
    I'm guessing you start of like this:
    (x )(x )
    Offline

    0
    ReputationRep:
    (Original post by multiplexing-gamer)
    Give your solutions to 2 decimal places.
    I'm guessing you start of like this:
    (x )(x )
    Use the quadratic formula
    Offline

    0
    ReputationRep:
    (Original post by multiplexing-gamer)
    Give your solutions to 2 decimal places.
    I'm guessing you start of like this:
    (x )(x )
    Use the quadratic formula
    Offline

    1
    ReputationRep:
    try the formula
    http://www.google.co.uk/imgres?imgur...1t:429,r:2,s:0
    Offline

    1
    ReputationRep:
    where a - number in front of x^2, b is number infront of x and c is the last number
    Offline

    0
    ReputationRep:
    complete the square
    • Thread Starter
    Offline

    2
    Oh yeh thanks guys
    Offline

    1
    ReputationRep:
    quadratic formula, it will be at the fron of the paper, but you have to give the + and the - values
    Offline

    12
    ReputationRep:
    (Original post by multiplexing-gamer)
    Give your solutions to 2 decimal places.
    I'm guessing you start of like this:
    (x )(x )
    The "solutions to 2dp" gives you a clue that it won't factorise with integer values. You can complete the square or use the quadratic formula. Since they don't want an exact form, putting everything into the quadratic formula will probably be faster.
    Offline

    2
    ReputationRep:
    (Original post by multiplexing-gamer)
    Give your solutions to 2 decimal places.
    I'm guessing you start of like this:
    (x )(x )
    Use x=\frac {-b \pm \sqrt{b^2-4ac}} {2a}

    a = the number in front of the x^2 = 1
    b= -2 (the number in front of the x) so -b = 2
    c= -1 ( the last number)

    the plus-minus sign means that there are two solutions (use the plus once and minus once)

    The mathematical term for 'in front of' is coefficient btw.
    Offline

    0
    ReputationRep:
    (x-1)^2 -2 = 0
    (x-1)^2 =2
    x-1 = sqrt(2)

    so x is 1 +/- sqrt(2)
    Offline

    0
    ReputationRep:
    (Original post by CuthbertDibble)
    (x-1)^2 -2 = 0
    (x-1)^2 =2
    x+1 = sqrt(2)

    so x is -1 +/- sqrt(2)

    so 0.41 and -2.41
    You made a mistake here. Your minus has changed to a plus.
    Offline

    0
    ReputationRep:
    (Original post by Gemini92)
    You made a mistake here. Your minus has changed to a plus.
    thanks
 
 
 
  • 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
    Has a teacher ever helped you cheat?
    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

    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.