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-   -   Completing the Square (https://www.askmehelpdesk.com/showthread.php?t=405593)

  • Oct 13, 2009, 01:31 PM
    antifrog16
    Completing the Square
    Hey could I have some help with these:

    (b) 6 3 0 2
    x − x + = by completing the square (giving an exact answer simplified if
    possible). (3 marks)


    (c) 2 7 3 2
    x − x = by the formula (giving exact answers).
  • Oct 13, 2009, 01:35 PM
    antifrog16
    Quote:

    Originally Posted by antifrog16 View Post
    Hey could i have some help with these:

    (b) 6 3 0 2
    x − x + = by completing the square (giving an exact answer simplified if
    possible). (3 marks)


    (c) 2 7 3 2
    x − x = by the formula (giving exact answers).

    (b) x^2 - 6x + 3 = 0 by completing the square (giving an exact answer simplified if
    possible). (3 marks)
    (c) 2x^2 - 7x = 3 by the formula (giving exact answers). (2 marks)

    sorry there are the questions
  • Oct 14, 2009, 10:50 AM
    Unknown008

    For an equation , the completed square form is:



    To do that, first of all remove (by factorisation) the coefficient of x^2:





    Then, divide the coefficient of x by 2, replace x^2 by x and x by 1. Put all into brackets and square them. Also, subtract the square of the coefficient of x you just divided by 2:



    Then, re expand your values:





    Care to try the part (b) that you asked?

    I (or another member) will tell you whether this is good.

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