Q50Comprehension3 Marks30 Apr 2023PassageBased on the above data, answer the given subquestions. Let f(x, y) = x^4 + y^4 + 4x^3 + 4y^3 + 4x^2 - 8y^2 - 5.The number of critical points of f(x, y) isYour answerPress Enter to check.