• May 18th 2010, 03:05 PM
dwatkins741
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 PM
pickslides
$s^2 = 9 + s(1-2s)$

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

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

$
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 PM
dwatkins741
Now I get it
I wasn't distributing the s before using the quadratic formula. Thanks so much!!