Hello.. I’m asked to find the second derivative (y’’(x)) at the point (3,1) when x^3+y^3=28. I have done the workings up until the point where I know I should be isolating (x^3+y^3) and substituting in 28 but I can’t see how the y component becomes y^3 .. I keep getting -2x(y^2-x^3)/y^5 ….. I saw on another forum that other people are getting -2x(y^3+x^3) … where am I going wrong in terms of having y^2 instead of y^3 ?? Thanks for any help .. also if anyone could send me in the direction of a good video for learning implicit differentiation thay would be amazing, my teacher only went over it very briefly so I need to learn it properly outside of class. Thanks so much