Question: 1. Find the differential of f(x, y) = √(x2 + y3) at the point (1, 2). Use it to estimate f(1.04, 1.98).
2. (a) Find the differential of g(u, v) = u2 + uv.
(b) Use your answer to part (a) to estimate the change in g as you move from (1, 2) to (1.2, 2.1).