Question 76654
what you have to do is get the terms that are in the sqrt alone. So, first you have to is subtract the 3 and the x  and bring them to the other side. 
you get:
sqrt(x-8)=-x-3
then square both sides so you get
x-8=(-x-3)^2
then FOIL the right side
x-8=x^2+3x+3x+9
Add like terms and set it equal to zero.
x^2+5x+17=0
*[invoke quadratic "x", 1, 5, 17]