2. (5 pts) Determine an equation of the tangent plane for f(x, y) when x = 1 and y = -1 given the following information: f(1, -1) = -2 fx(1, -1) =4 fy(1, -1) = -7 fxx(1, -1) =3 fry(1, -1) =2 fyy(1, -1) = 5