#### 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!!

#### pickslides

MHF Helper
$$\displaystyle s^2 = 9 + s(1-2s)$$

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

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

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

can you finish it?

dwatkins741

#### dwatkins741

Now I get it

I wasn't distributing the s before using the quadratic formula. Thanks so much!!