Let $z = x ^ { 2 } + y ^ { 2 }$

Multiple Choice

Let $z = x ^ { 2 } + y ^ { 2 }$ . Then $\Delta z$ , the change of z from (1, 3) to (1.1, 3.2) , is

A) 2.01
B) 1.87
C) 1.45
D) 1.25
E) 1.08