Need the answer by step please! Thanks!

Question 3. f(x,y) is a differentiable function with f(20, -100) = (5, -2). Let g(x,y) = f(xy2,2x2y) and calculate g(5,-2). Let n = (4,2). What is the directional derivative (5, -2)? Use the above to approximate g(4, 0) if g(5, -2) = (2, -1).

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Need the answer by step please! Thanks!  Question 3. f(x,y) is a differentiable function with f(20, -100) = (5, -2). Let g(x,y) = f(xy2,2x2y) and calculate g(5,-2). Let n = (4,2). What is the directional derivative (5, -2)? Use the above to approximate g(4, 0) if g(5, -2) = (2, -1).

Need the answer by step please! Thanks!

Question 3. f(x,y) is a differentiable function with f(20, -100) = (5, -2). Let g(x,y) = f(xy2,2x2y) and calculate g(5,-2). Let n = (4,2). What is the directional derivative (5, -2)? Use the above to approximate g(4, 0) if g(5, -2) = (2, -1).

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