Let $z = x ^ { 2 } + x y + y ^ { 2 }$ , $x = 2 u + v$ , and $y = u - 3 v$ . Show that $\frac { \delta ^ { 2 } z } { \delta u \delta v } = - 7$

Name: Let $z = x ^ { 2 } + x y + y ^ { 2 }$ , $x = 2 u + v$ , and $y = u - 3 v$ . Show that $\frac { \delta ^ { 2 } z } { \delta u \delta v } = - 7$
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The Answer of Let $z = x ^ { 2 } + x y + y ^ { 2 }$ , $x = 2 u + v$ , and $y = u - 3 v$ . Show that $\frac { \delta ^ { 2 } z } { \delta u \delta v } = - 7$

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

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