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Thread: Difficulty with a factorisation problem

  1. May 9th 2012, 09:43 PM #1
    FH88
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    Difficulty with a factorisation problem

    Needed to solve :

    2x* - 3x - 4 = 0

    Any help would be greatly appreciated.
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  2. May 9th 2012, 10:00 PM #2
    amul28
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    Re: Difficulty with a factorisation problem

    Roots of a quadratic equation ax^2+bx+c=0 are

    \frac {-b-\sqrt{b^2-4ac}} {2a} and \frac {-b+\sqrt{b^2-4ac}} {2a}, using these you get two roots.

    For the given equation the roots are 2.35078 and -0.85078 (the have rounded the roots)

    \therefore the factore are (x-2.35078)\miultiply(x+0.85078)=0
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  3. May 9th 2012, 10:09 PM #3
    princeps
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    Re: Difficulty with a factorisation problem

    Quote Originally Posted by FH88 View Post
    Needed to solve :

    2x* - 3x - 4 = 0

    Any help would be greatly appreciated.
    Hint :

    2x^2-3x-4=\frac{1}{8}(16x^2-24x+9-41)
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