I understand the concept behind this type of funciton, but am unable to simplify it into the for that my teacher wants:

2x^2-3y^2 = 4, d^2y/dx^2 (second derivative)

The answer is -8/9y^3.

Also, how do I get my questions in the proper format? I notice mine are crude and basic compared to some here.

Thanks for your help, and sorry to waste your time with such a simple question.