Suppose that a function f(x,y) has a critical point at (2,3). Given that fæx (2, 3) = -4, fæy(2,3) = 0, fyy(2,3) = –5 what does the second derivative test tell us about the nature of this critical point?

Find the average rates of change of f(x)=x2+2x (a) from x1=3 to x2=2 and (b) from x1=2 to x2=0.

Determine if the statemment is true or false. If the statement is false, then correct it and make it true. If the function f increases on the interval -,x1 and decreases on the interval x1,, then fx1 is a local minimum value.

Consider the three points (2, 2), (4,4), and (6, —2). (a) Supposed that at (2, 2), we know that fx = fy = 0 and ƒxx 0, function near the point (4,4)? ? fxy fry = 0. What can we conclude about the behavior of this (c) Supposed that at (6, -2), we know that fx = fy = 0 and fxx > 0, fyy < 0, and fxy = 0. What can we conclude about the behavior of this function near the point (6, -2)? ? Using this information, on a separate sheet of paper sketch a possible contour diagram for f.