Solve the problem.
-Find the derivative of the function $f ( x , y ) = x ^ { 2 } + x y + y ^ { 2 }$ at the point $( 4,5 )$ in the direction in which the function increases most rapidly.
A) $\sqrt { 293 }$
B) $3 \sqrt { 42 }$
C) $\sqrt { 299 }$
D) $\sqrt { 365 }$

Question

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The Answer of Solve the problem.
-Find the derivative of the function $f ( x , y ) = x ^ { 2 } + x y + y ^ { 2 }$ at the point $( 4,5 )$ in the direction in which the function increases most rapidly.
A) $\sqrt { 293 }$
B) $3 \sqrt { 42 }$
C) $\sqrt { 299 }$
D) $\sqrt { 365 }$

Solve the Problem f(x,y)=x2+xy+y2f ( x , y ) = x ^ { 2 } + x y + y ^ { 2 }f(x,y)=x2+xy+y2

Solve the Problem $f ( x , y ) = x ^ { 2 } + x y + y ^ { 2 }$