Answer:
Rate of change = 18/√74
Step-by-step explanation:
The rate of change of f at x_o in the direction of the unit vector v is given by: ∇f(x_o) × v
Now, for us to get the direction of the unit vector, since we are told that f(x, y, z) = xyz in the direction normal to the surface yx² + xy² + yz² = 3, we will use; g(x, y, z) = yx² + xy² + yz² = 3 and k =3 to give;
∇g(x,y,z) = (2xy + y², (x² + 2xy + z²), 2yz)
So;
∇g(1, 1, 2) = (2(1 × 1) + 1²) , (1² + 2(1 × 1) + 2²), 2(1 × 2))
This gives;
∇g(1, 1, 2) = (3, 7, 4)
Now,
||∇g(1, 1, 2)|| = √(3² + 7² + 4²)
||∇g(1, 1, 2)|| = √74
Normal vector would be given by the formula;
v = [∇g(1, 1, 2)]/[||∇g(1, 1, 2)||]
Thus;
v = (3, 7, 4)/√74
Let's not forget that our ∇f(1, 1, 2) = (1, 1, 2)
Thus, rate of change is given by;
∇f(1, 1, 2) × v = (1, 1, 2) × (3, 7, 4)/√74
This gives;
Rate of change = [(1 × 3) + (1 × 7) + (2 × 4)]/√74 = 18/√74
