Algebra

First, let's combine all like terms to get a real quadratic. 

We get $x^{2}+8x+9$.

The descriminant of the quadratic is $b^2-4ac$ for those in $ax^2+bx+c$

We have $8^2-4(1)(9) = 64-36=28$

So 28 is our answer!

Thanks! :)