Find the maximum and minimum values of $f ( x , y ) = x ^ { 2 } + 7 x y + y ^ { 2 }$ subject to the constraint $x ^ { 2 } + y ^ { 2 } = c$ , with $c 0$ .Your answers may depend on c.

Question

Find the maximum and minimum values of $f ( x , y ) = x ^ { 2 } + 7 x y + y ^ { 2 }$ subject to the constraint $x ^ { 2 } + y ^ { 2 } = c$ , with $c > 0$ .Your answers may depend on c.

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The Answer of Find the maximum and minimum values of $f ( x , y ) = x ^ { 2 } + 7 x y + y ^ { 2 }$ subject to the constraint $x ^ { 2 } + y ^ { 2 } = c$ , with $c > 0$ .Your answers may depend on c.

Find the Maximum and Minimum Values Of f(x,y)=x2+7xy+y2f ( x , y ) = x ^ { 2 } + 7 x y + y ^ { 2 }f(x,y)=x2+7xy+y2

Find the Maximum and Minimum Values Of $f ( x , y ) = x ^ { 2 } + 7 x y + y ^ { 2 }$