http://i.imgur.com/XviXYODh.jpg

The question is #10,

I am really bad at word problems and having to create an equation on my own...

x^2 - 1/2x = 11

That is all I got and I am pretty sure I am wrong, I didn't go further with that equation I made...

The answer to this question is -3.80 and 5.80.

Any help would be great, thanks!