At the point (1, 2) the function f(x, y) has a directional derivative of 2 in the direction toward (2, 2) and a directional derivative of -2 in the direction toward (1, 1). Find the directional derivative of f at (1, 2) in the direction toward the point (4, 6).
A) -
B) -
E) 4

Question

At the point (1, 2) the function f(x, y) has a directional derivative of 2 in the direction toward (2, 2) and a directional derivative of -2 in the direction toward (1, 1). Find the directional derivative of f at (1, 2) in the direction toward the point (4, 6).
A) - 
B) - 
E) 4

Quizplus · Accepted Answer

The Answer of At the point (1, 2) the function f(x, y) has a directional derivative of 2 in the direction toward (2, 2) and a directional derivative of -2 in the direction toward (1, 1). Find the directional derivative of f at (1, 2) in the direction toward the point (4, 6).
A) - 
B) - 
E) 4

At the Point (1, 2) the Function F(x, Y) Has