1. The problem statement, all variables and given/known data Find the inflection points and use second derivative test to determine where the function is concave up or down 2. Relevant equations f(x) = (x - 1)/(x2 - 4) 3. The attempt at a solution f'(x) = (-x2 + 2x - 4) / (x2 - 4)2 f''(x) = 2x3 - 6x2 +24x -8 / (x2-4)4 This is where I am stuck. I can't solve the numerator set to 0. You can factor out the 2 and thats about it. Cubic that I cant solve. I'm looking at: x(x2 - 3x +12) = 4 and thinking that maybe I can use the quadratic equation to find when that quadratic = 0 but I dont think that will help me.