Let $z = 2 x ^ { 2 } + x y - y ^ { 2 }$ . Then the change of z from (2, -1) to (2.1, -1.1) approximated by $d z$ is
A)1.32
B)0.94
C)0.77
D)0.58
E)0.3

Name: Let $z = 2 x ^ { 2 } + x y - y ^ { 2 }$ . Then the change of z from (2, -1) to (2.1, -1.1) approximated by $d z$ is A)1.32 B)0.94 C)0.77 D)0.58 E)0.3
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The Answer of Let $z = 2 x ^ { 2 } + x y - y ^ { 2 }$ . Then the change of z from (2, -1) to (2.1, -1.1) approximated by $d z$ is
A)1.32
B)0.94
C)0.77
D)0.58
E)0.3

Let z=2x2+xy−y2z = 2 x ^ { 2 } + x y - y ^ { 2 }z=2x2+xy−y2

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