Challenge 3 Consider a polynomial function with two independent variables x and y. If fxx = a, fyy = b, fxy = a*b, where a is the first digit of your student number and b is the last digit of your student number. If a _b - (ab)2 _0, then the function has a saddle point. With regard to the first blank, which of the following math operations is correct? (No answer given) With regard to the second blank, which of the following signs is correct? (No answer given) O = O>