I keep making some type of mistake on this problem, can someone please show how to work it out? I think maybe I get the signs mixed up. I am supposed to work it using the quadratic formula.

s^2 = 9 + s(1-2s)

Thanks!!

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- May 18th 2010, 03:05 PMdwatkins741Question: Quadratic Formula
I keep making some type of mistake on this problem, can someone please show how to work it out? I think maybe I get the signs mixed up. I am supposed to work it using the quadratic formula.

s^2 = 9 + s(1-2s)

Thanks!! - May 18th 2010, 03:09 PMpickslides
$\displaystyle s^2 = 9 + s(1-2s)$

$\displaystyle s^2 = 9 + s-2s^2$

$\displaystyle 3s^2 -s- 9 =0$

$\displaystyle

s = \frac{-(-1)\pm\sqrt{(-1)^2-4\times 3 \times -9}}{2\times 3}=\dots

$

can you finish it? - May 19th 2010, 01:59 PMdwatkins741Now I get it
I wasn't distributing the s before using the quadratic formula. Thanks so much!!