Chapter 4.4, Problem 195E

For the following exercises, complete each task.

195. Let $z=f\left(x,y\right)=x{e}^y$. Compute $\Delta z$from P( 1 2) to Q(1.05. 2.1) and then find the approximate change in z from point P to point Q. Recall $\Delta z=f\left(x+\Delta x,y+\Delta y\right)-f\left(x,y\right)$. and dz and $\Delta$z are approximately equal.