Let $f ( x , y ) = x ^ { 2 } + 5 y ^ { 2 } - 5 x$ What is the direction of maximum rate of change of f at (1, 1)?

Name: Let $f ( x , y ) = x ^ { 2 } + 5 y ^ { 2 } - 5 x$ What is the direction of maximum rate of change of f at (1, 1)?
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The Answer of Let $f ( x , y ) = x ^ { 2 } + 5 y ^ { 2 } - 5 x$ What is the direction of maximum rate of change of f at (1, 1)?

Let f(x,y)=x2+5y2−5xf ( x , y ) = x ^ { 2 } + 5 y ^ { 2 } - 5 xf(x,y)=x2+5y2−5x

Let $f ( x , y ) = x ^ { 2 } + 5 y ^ { 2 } - 5 x$