Let $f ( x , y ) = 4 x ^ { 2 } - 9 y ^ { 2 }$ .What is the equation of the tangent plane to the graph of $z = f ( x , y )$ at the point $( 5,1 )$ ?

Name: Let $f ( x , y ) = 4 x ^ { 2 } - 9 y ^ { 2 }$ .What is the equation of the tangent plane to the graph of $z = f ( x , y )$ at the point $( 5,1 )$ ?
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The Answer of Let $f ( x , y ) = 4 x ^ { 2 } - 9 y ^ { 2 }$ .What is the equation of the tangent plane to the graph of $z = f ( x , y )$ at the point $( 5,1 )$ ?

Let f(x,y)=4x2−9y2f ( x , y ) = 4 x ^ { 2 } - 9 y ^ { 2 }f(x,y)=4x2−9y2

Let $f ( x , y ) = 4 x ^ { 2 } - 9 y ^ { 2 }$