Use the differential dzto approximate the change in the function z, shown below, as(x,y) moves from point (1,1)to point (1.01,0.98).(Round your answer to five decimal places.)z=4-x2-y2dz= Compute the actual change in the function z.(Round your answer to five decimal places.)z=Use the differential dzto approximate the change in the function z, shown below, as(x,y) moves from point (1,1)topoint (1.01,0.98).(Round your answer to five decimal places.)z=4-x2-y22dz=Compute the actual change in the function z.(Round your answer to five decimal places.)z=