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  1. Big Jeff

    Factor y = -3x^2 - 2x + 5

    Agreed.
  2. Big Jeff

    Factor y = -3x^2 - 2x + 5

    When I need to solve a quadratic, I simply solve it by completing the square (unless, of course, it's already a perfect square trinomial). No formula to memorize, no factoring, just the same procedure every time. :smile:
  3. Big Jeff

    Stirling's approximation

    This article at Mathworld derives Stirling's approximation step by step. :smile:
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