1. The problem statement, all variables and given/known data Solve 4y-y2=x for y. 3. The attempt at a solution First I tried using the quadratic equation with a=-1 b=4 c=-x y=(-b±(42-4(-1)(-x))(1/2))/2(-1) That got me this far: y=2±(8-2x)(1/2) Then I checked wolfram and now I am confused Spoiler y=±2-sqrt(4-x . Did I not approach this corectly?