1. The problem statement, all variables and given/known data Given y = x^2 + 6 / x find x if dy/dx equals 0 zero 2. Relevant equations dy/dx = v du/dx - u dv/dx / v^2 3. The attempt at a solution I have got as far as dy/dx = x^2 - 6 / x^2 However then zero must equal Sqrt 6, which 2.44.... - can someone please confirm. Many thanks.