30 Minutes: Solving Problems
15 Minutes: Recap how to classify each point
05 Minutes: Summary
1. Give an example where D = 0 and the test is inconclusive.
2. Can a saddle point occur when both f_xx and f_yy are positive? Explain.
3. For f(x,y) = x^4 + y^4 - 4x^2y^2, classify all stationary points.